There are a few things you can try. The first is feed her in her cage. Feeding in the cage is less stressful on BPs and DOES NOT lead to cage aggression. If she doesn't go for it right away try leaving it in over night and do not harass her with it when you go to feed. I have one BP that will only eay if I place it in her tub near her and then leave her alone. Another thing you can try is to feed live. Most will usually go for live prey. You basically have to wait them out sometimes. I spent 3 weeks trying to get my PYB to eat and then she only ate for 4 weeks before she stopped again. BPs can be picky.
Do you know if she has eaten before?