Yes. Are you feeding f/t or live?
Here's what's worked for me every time. Get some dirty mouse bedding and put a handful in the front of her enclosure.
When you see her actively flicking her toungue and investigating and looking for the mouse (from the smell of the mouse bedding), offer a white rat that's as close to the same size as your mice that you're feeding, or just slightly larger.
She should strike immediately when she's in that hunt mode.