If it is indeed due to her moult, she'll be better soon!My partner thinks she looses balance because she has no wings left. She also acts extremely scared, which could explain why she jumped down from the roost instead of walking to the ramp and since she has no wing feathers she crashed.
But that doesn't explain the way she crouches when she walks, or the fact that she circles around her destination walking sideways.
I am almost sure it's related to her moult. It is both very hard and very fast. I think it's an unlikely coincidence.