refuses food for the 5th month

[embohannon]

I own a 4 year old 4 foot long ball python. She has eaten live under strict supervision all her live. She usually eats one small rat every 2 weeks. Every late winter she takes a 2 month brake from eating. This year she stopped eating as usual but never started eating again. She drinks water but refuses live rats, live mice or frozen rats and mice. I took her to the vet but was told that she was healthy. she is starting to look skinny and I'm getting worried