Thanks for the comments guys.

I know about the possible shock to her system. That's why I'm just going to keep her on the same SIZE prey, but bump her up to the frequency at which my snakes eat. If she doesn't want it, she doesn't want it. I figure she'll know what's best for herself and as long as I keep offering then between the two of us we'll get it worked out.

As for the question of her growing, I'd been wondering that myself. I wouldn't be surprised if 5 years of sub-par (to say the least) nutrition hasn't permanently stunted her. I guess we'll see as time goes on.

And regarding the parasites - I intend to have a fecal done as soon as she gives me one. -lol- I asked the owner if they'd taken her to the vet ever, and they said they had when she was younger for a check-up and when they had to remove her tail tip. They said the vet never found anything wrong with her. The screen enclosure was kept in the living room of a very nice house. I don't think she would have been exposed to parasites in that way at least. But still, just to be safe I will eventually take her in.

I'm sad to hear that her color will change because I really fell in love with how she looks now. But if it's caused by improper nutrition, then it can't change fast enough!