Going to be keeping her in the house, you say?
Buy some of those little foam earplugs that squish inside your ear, and put them in. Then get some of the ear defenders designed for shooters, the ear muff style, and put those on as well. Stop by the local liquor store and get a bottle of whatever you like best. Actually, no, get a case. Honestly, prescription sedatives are what you really need, but alcohol is easier to get and also easier to explain.
Oh wait. You wanted to know what would make THE BIRD more comfortable.
I've never been in this situation, and I'm so glad about it. There are a couple of things that come to mind that have been helping here, with my untame bird. MY bird, however, is certain to be light years more tame than yours, just because he has known people for years, although from afar and not fondly.
1) A really big cage. You don't want the bird to feel trapped, although she will. You want her to have options, and one of those should be to retreat into the private section of the cage you will arrange for her. In order to have a private and a semi public area of the cage, the cage must be big enough to accommodate. Makes sense, yes?
2) Privacy, not a dark trap. For Sinbad, I tried various degrees of covering the cage, from totally with a light sheet to not at all. I found that a total cover was too much. He was afraid to seek shelter in a place with no visible (if not actual) escape route. I am sure he was interpreting it as a trap. I ended up covering the top, side, and front of half the cage with cardboard. I cut windows, actually long slits the width of about two fingers, until the bird was no longer afraid to flee me into the covered area. The back of the cage is up to a wall, so it was not covered, and lets in a little more light that way. IF I did not have the complication of other birds ending up above his cage from time to time, I would have made windows in the roof. However, I didn't want him scared by the other birds, so I left it solid.
3) Options. While Sinbad has 31 inches of covered space, he chooses to sit just a few inches into the covered area. He may choose this spot because it has a high perch and he can feel covered but retain an excellent view of the half of the room with ME in it. (Some might suggest I set it up that way on purpose.....
) This is also where he sleeps. His other choice of high perch is far into the covered area. I have not seen him spend much time there. Another reason he might be choosing the perch he does could be that it is just about smack in the middle of his total space. He does venture to the third high perch, which is entirely out in the open, and closest to his neighbor, Rocky, of whom he seems quite fond. If he gets spooked, he flies right back to his safe perch.
4) A Duck Blind. I can hear you saying "Huh??" Sinbad is not comfortable with me looking directly at him for much time, though at the start I could not look at him at all, or be in the room. So, he is improving. Earlier, however, it was impossible for me to observe him (because of his demonstration of protest) unless I hid, lying on the floor, under a sheet. I kid you not; this happened. If there is furniture you can hide behind, that's good, but you might need a sheet. Another option I was prepared to try, but thank goodness did not need, was a standing screen with a peephole. I know someone who promises me that birds won't mind you looking at them if they cannot see your eyes, so you should wear sunglasses. Another suggestions has been to use a mirror to look behind you. I have less faith in the mirror because I think it's bound to send some flashes towards the bird. Sunglasses, unless they scare the bird on their own, seem a smarter choice to me, but I didn't try either one.
5) Moving and speaking gently and only when absolutely necessary. Obviously you will need to do some cage maintenance. Take it really easy there, and be sure to call gently and quietly ahead before you enter the room. Keep gestures small and LOW. Don't wave entire sheets of newspaper around - roll and unroll them carefully right where they're needed. Be gentle, be slow, but efficient and don't linger because as long as you're there, Birdie is upset. Minimize upset. I have not changed Sinbad's papers at all. (Ewwwww!!!!) I feel it is more important to not upset him. I'll change them "soon", either when they become intolerable, or when I see it won't upset him, whichever comes first.
6) Treats. Just because she's hurt and wild doesn't mean she won't like a treat. I put Sinbad's treat cup all the way at "my end" of the cage, and drop treats through the bars as I go by, without lingering. If you read my Sinbad thread, you'll know he has figured out how the treat cup works. It cannot be bad for the bird to understand treats come from you. (Understatement.
7) You. I might take some dissenting feedback for this, but I think you should spend time as close to in the same room as you can without eliciting a hint of protest from the bird. Note I said a hint-- a hint would be the first sign of uneasiness, not the screaming and flailing about. It would be posture, rigid gaze, possibly a way of holding the feathers. For my Sinbad, once I knew he was comfortable accessing his entire space, I did remain in the room when he displayed the hint of uneasiness FROM THE OPEN PERCH. That is to say, when he was far into my end of the open space of the cage, with four feet to flee and cover to hide in, and he instead remained without fleeing, I allowed him uneasiness caused by me. (This is where the dissenting opinions will come, and why I cannot advise you to do the same.) I felt that so long as he had the choice to flee, I would give him the choice to face me and learn about me (or, more accurately, my back....). I did not think he would be developing familiarity with me if I was never there. You should also be sure to let your bird hear the noises you make as you go about other parts of the house. She can keep tabs on you that way, instead of wondering when you;re going to pop up unexpectedly. Of course, you have to play this one by ear, and don't overexpose the bird to you, too much or too soon. Does this make sense?
Of course she is going to need things to make her feel at home, so I would say *natural* things like branches, sticks, leaves, etc. Give her something to do all day - bark to peel, leaves to shred, foraging to do, etc. Don't let her only puzzle be how to unlock that cage.
These are the things that occurred to me, right away. I must stress the difference between your bird's situation and mine. I'm certain your situation is much more extreme. I also hope people with more experience with "from the wild" birds will chime in.