I'd say that being as consistent as possible would be the best bet. My girl never lost weight either and she had plenty to hold her over. So I stuck to my guns and figured she'd eat when she got hungry. Luckily I have a big enough collection that the rats didn't go to waste. The idea of thawing, refreezing and thawing didn't sound like a good idea to me. However, if she starts losing like Piedlover79 had happen then try switching it up a bit.So long story short, I'd stick with what she ate "The best" for you.