Honestly, it sounds like you are having the SAME exact problem as i did. My 1200 gram girl had not eaten since january 21st. All different sized rats i tried she wouldn't eat. Then 2 days ago i got some very small adult mice, she ate 3 in a row no problem, hungry for more. Its weird, but i feel that if she wants mice, i'll get her mice, as long as shes eating. But my girl did eat rats in the past with ease, so sometimes they just want a chane of pace. Its pretty normal from what i hear across the board.