It really depends on the size, some will even brumate them when they encounter young animals that persist in their refusal but generally with proper husbandry they should eat especially if they are good feeders in general and she was.
My guess if you downsize some more and change the scent it will work I would likely also bump the cool side a little to 80/82 if you can. If she was eating before there is no reason she is not eating now especially if your temperature reading are correct (taken with a digital thermometer and on the floor level of each side.)
Most issues I have ever encounter with young individual (Produced or bought) are usually with males not females.