I can't say for sure what the problem could be to me it sounds like she's just fasting. I've never had one of my girls fast that long but my pied boy which is also my oldest fast for 8 months. Winter seems to be prime time for bp's to fast so with that said about winter and my pied's 8 month fast just don't let it stress you to much. Just keep an eye on her weight and behavior if it's been 2 months since her last meal and her weight pretty much looks the same then she's probably fasting. Speaking of which my pied boy is actually fasting right now. I think its been a month and a halfish and believe me i know he's fasting. He'll go back to slammin rats eventually. This is just my take on your situation best of luck.