It would not hurt your snake to feed her more especially if you're feeding mice. I strictly feed rats unless they absolutely will not take them. I have witnessed that feeding mice hinders a ball python's growth potential. It sounds like you're feeding a pet ball python so the mice will work. The best rule of thumb is to feed one prey item a week (hatchlings twice a week) that is about equal in girth to the widest part of your snake.
-Garrett Voodoo Constrictors