They can go like a year without food. I wouldn't worry as long as your husbandry is right. My girl just started eating probably about a month ago. She quit eating back in Oct or Nov '15. I would just offer her a rat every 3 weeks when my boas ate and if she wanted it, great, if not my boas got an extra snack. BPs can drive you crazy. Dottie lost a little weight. I never weighed her. Just went by eyeballing her. She has since put that weight right back on after just a month of eating. As long as your snake is passing urates and drinking water, i'm sure it will be fine. They must have water or they will die. Food, not so much so.