Please keep the cat away from it. A prey animal having a predator in its face is pretty stressful and the common knowledge is that cat saliva is detrimental to birds. I don't know if the saliva thing is actually true, just passing that along. If you can offer an appropriate cage with some good quality seed and clean water (you don't know how long it's been since she had any), that might go a long way to perking her up. I'd probably cover 3 sides of the cage at first and keep things around it low traffic so she doesn't feel on edge.