I don't want you to have to wait any longer, so I'm going to go ahead and answer without knowing the temperatures. Crested geckos are one of the more difficult lizards to keep.
Your gecko is critically ill, and may not survive.I know that isn't what you want to hear, but I believe you deserve honesty. However, we're going to do our best to help her pull through.
Crested geckos will die if they are subjected to temperatures of 85*F or higher. . You want to maintain the temperature between 72*F and 80*F. Be sure to use a good thermometer and make sure you do not overheat her. But we also don't want her to be chilly.You could use an under-the-cage heat mat, or a light. When using a light, you can adjust the temperature by moving the fixture up or down, or by using a different size light bulb.
From what you have described, the gecko is dehydrated. I'll give you a first aid measure for that. Buy some Pedialyte (yes, the kind for human infants). Prepare a shallow bath consisting of 1/2 water (at about 75*F) and 1/2 Pedialyte. Soak your gecko for about 20 to 30 minutes twice a day. Reptiles can absorb the electrolytes and fluids through their vents (where droppings pass out), so make the water deep enough to cover the vent. Be sure to supervise closely.
The foods you're giving her are not a very good ones. Repashy makes a better one, and she may be more inclined to eat it. If you can't find it locally, here is an online source:
Also, try feeding her some baby food fruits. Crickets should only be rare treats. After being warm enough and having a couple of soaks, her appetite may improve. You can try dropping a small dollop of baby food fruit right on the end of her snout. sometimes they will lick it off.
It would be a good idea to schedule an appointment with a reptile vet tomorrow. This link will take you to a directory of them:
If you have more questions, let me know. I hope your gecko will recover.
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