what mutation is this?

[angeldc77]

output_4-464x488.jpg (74.63 KiB) Viewed 786 times

output_3-404x515.jpg (47.59 KiB) Viewed 786 times

output_2-588x449.jpg (77.9 KiB) Viewed 786 times

output-361x453.jpg (54.91 KiB) Viewed 786 times

The person that owns this young hen was told it was gray split to violet. I understand that gray can mask violet due to the same structural mutation creating both phenotypes. Is it possible that's the case here? I see dark flights but then the tail is lighter like the rest of the body. Is muave a possibility?