I'm sorry to hear about your troubles. My ball went 6 months from Nov 06 through to May 07, but never seemed to lose weight. She was on p/k and f/t small and medium rats, but now have the most frequent success with live albino mice.

I agree with Dr Del; if my girl had been loosing weight, I would have taken her to a vet just to be sure. But my other recommendation would be maybe even less handling and try different feeders...live mice, dead mice, maybe ASF's if you can get...