my BP did the same thing, staying in the warm hide and not eating, I found out that the food we offered was to big! so we fed him two small baby fancy mice. the temps should be 87-90 on the warm side and 77-80 on the cold side. another reason could be sickness or going in shed soon. or just the plain stress of a new home. I know that once Beans ate he was super lively and looking around a lot! hope your problem is fixed!
TIP: if the snake is around a year old and on rat pups and not eating you can get two baby mice that are still on milk, they don't do as much damage if they bite, but that's if you're feeding live. if the breeder fed F/T then feed F/T and get tips and details from the breeder, if they fed live then try what I mentioned in the beginning of the tip, just keep in mind to feed one at a time, wait for her to get it down and to yawn (to adjust jaw) and then throw the other one in and do the same!