You want to feed a prey equal the girth (widest part of your BP's body) size once a week for now, knowing that as an adult if it is in fact a female she will never need anything bigger than a medium rat.
Pinkies and fuzzies are way too small so those are out and you need to feed the appropriate size prey. Since she is a pet I would feed once a week and establish a solid routine of feeding the same day each week.