Dumeril Boas are aggrassiv eaters, they don,t go off food like ball pythons. There must be a reason for that. Is she healthy? Does she have any kind of health problems? If she is healthy, you should ask the store where you bought her from what she usually ate there. I would feed her at this age and size adult live mice. Don,t switch between live and frozen just stick to one of them. Does she spend time at the warm side? If yes then its ok. If no then reduce the temperature to 86-88f. I fed my male Dumeril Live mice until he reached 10 months old and then i switched him to live rats. he eats regulary, never went off food.