I know this is a bit late, but I just recently was able to post on the forums. Ferrets are carnivores and should not have dog food or fruits/veggies/etc because of this. Cat food should be fine (I've fed it to mine in a pinch), but a good ferret food will do wonders for her. Make sure she has plenty of out-of-cage time and she should be fine until her parents come and get her. Good luck!
Rattie boys: Shunsui, Byakuya, Jushiro, Gin, Aizen.
Rattie Girls: Rosemary, Thyme, Retsu, Isane, Lisa, Rangiku, Nemu.
And the others: Lily (Dog), Watari (Cat), Hichigo (Ferret) and Elune (The crazy betta fish).