Have you taken her to the vet? Is there a reason why she wont eat pellets? Teeth? I dunno. Just thinking out loud. I got a new book called Why does my rabbit......? The author said that her rabbits never had pellets and lived quite happily on hay, carrots, kale and dandilions! But then if you're wanting her to put weight on..... Well I hope she is ok anyway. I'm a new bunny mummy so I have very little experience in rabbity things. Know all about controlling sticky butt though!!