As long as the prey item is about as big around as her (unless she's seriously skinny) and she's getting one a week, then she isn't hungry. I've seen a video of a ball python doing a similar biting behavior before, so I think I know what you're talking about. It's pretty odd ,but not unheard of. She might be going through a phase where she doesn't really want to be handled for whatever reason (going into shed, just doesn't want to be bothered, etc...) and the only advice I can give you is keep handling her regularly and see if she stops when she gets used to you.
Good luck with her!
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