How long have you had her? I give all of my new snakes at least a week to settle down before I try to feed them. I also don't feed them in their bins. I think it conditions them to think when you open the bin, it's time to eat. ( a good way to be mistaken for food ) If she doesn't eat right away, you can try putting her in a brown paper bag with the feeder, and just leave it over night. It should be gone in the morning.
Good luck!