Things to check-
If you have AC on or windows open at night, how cool is it and is her underside cool to the touch. Even in the summer, hedgehogs can try to hibernate if their environment is too cool
Is her water bottle working properly when it is in the cage-if they can't drink they may not want to eat.
You had said that she keeps flipping her food over-if she does this can she get to the food or is it under the bowl?
Anything else change or seem different? Does she seem sick ?