Im so sorry your girl flew away! Its heartbreaking to loose a friend.
Females are the dominant sex in IRNs. They are the boss and can injure or kill a male if shes not happy with him.
I would definately keep them separate for a while. They do need time to adjust. But keep in mind, females will dominate and this will almost certainly always be.
If you are keeping a male and a female, be prepared for them to breed. As I recently found out, 2 years ago, I intended on getting my tame 8yo male a 'friend'.. who turned out to be female, they are now happily making babies for the first time. She has always bossed my male around. Never hurt him though.. just puts him back in his place with body language sometimes a lunge. I was aware our new bird could be a female though, and I could end up loosing my tame pets as this usually happens when IRNs start to breed. I did think this through. So please respect that your female might want to breed,
if she accepts him. During breeding season you might loose any bonds you might have with them.
Give them time, however long they need, and keep an eye on them at all times when they are interacting without the safety of the cage. Do have the cages side by side not ontop of each other.
Clipping your females wings will help your male out if he needs to escape from her.
I hope it all works out for your male and female.
