Why wont my ball python eat?

My babii is approximately 5-6 months old, maybe 1 1/2 ft long & idk her weight now. But what i wanna know is why she isn't eating? I got her in august & since ive had her shes eatin about 8-9 times but in december she just stoped eating & i know ball pythons sometimes do that fasting thing in winter months which is what i thought it was but near the end of december (24-29th) she decided to eat 2 mice once on the 24th & once on the 29th i know im not suppose to do that but i really wanted her to eat. & now (january 28) she hasn't eatin in like 4 weeks & is starting to get really skinny. When i try to feed her she'll strike, contrict & just when she starts eating it she just lets go & trys to get out of her feeding tank. I kno its normal for ball pythons to go a long time without eating but its scaring me how skinny shes geting. I normally feed her frozen thawed & hav tried different things to get her to eat, even offered her a live that she wouldnt eat either. Nothing in her tank really changed except a new hide i got for her that she seems to love. So what could ii do to get her to eat? or should i just keep offering her mice every week like i normally do & hope she eats?