They don't hibernate like tegus do. If she's laying around without moving, there's most likely something going on.

The temps sound high enough. If you paid under $150 for her, I doubt she was actually CB, since there's a lot of folks selling captive hatch or even WC as CB. I'm not saying definitely.. but it's a possibility. I'd see about getting her treated for parasites, at least see if you can get a poo sample to get it checked.

I feed mine ground turkey, eggs, rodents, chicks, fish.. they are remarkably indiscrimate in their eating habits. I do NOT cook any of it. Sorry, I know folks saying you have to cook the eggs.. but I have yet to see a monitor roaming the savannahs of AFrica with a cookpot and a lighter to cook the eggs they find and eat. Same for ground turkey and fish. We don't cook the rodents to feed our pythons do we? Why do so for monitors?

That said, for babies, the best is insects. If you have a picture, we might be able to tell if she's underweight. But she should be more perky than laying in one spot for 12 hours. I hope she turns around for you.