First of all, how much does your BP weigh? 3 years old should be an adult ball python and they should be on 1 small - medium rat every 7 days. If you feed mice, that's like 5 or 6 mice at a time. You will save money and stress on your snake by feeding rats instead of multiple mice.
That said, if you've only been feeding her 2 mice every 10 days, she's probably a little thin. So, she may need something smaller like a weaned rat. Could you show us a picture of her and a weight? That will help us out to determine what and how often she should be eating.
As for your original question, don't hold her until at least 24-48 hours after a meal. She's probably hungry.
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