SHowering is one of the best ways to hydrate a cham. Some wildcaught chams were brought in country earlier this year gravid. They were showered for 2 hours, and then laid their eggs. I would strongly recommend showering her for 1 hour or more and see if that helps. It worked for us when we had a female panther who was overdue and reluctant to lay her eggs. You're not going to be able to get her a vet today, anyway. There are steps a vet can take to "induce", but I do not have first hand knowledge of that. But that would have to wait until tomorrow, anyway.'
Place her in her plant, in the shower, and "bounce" the water off the wall of the shower so it rebounds onto her and the plant, to soften the impact. Make the water temp what would be comfortably warm to you, test it on your wrist, but not hot. Keep the bathroom dark so the shower will be restful for her.
While she is in the shower, have someone run to the store and get some pedialyte (it is in the baby food section- it is what they give to sick babies, and it is what is recommended to help a badly dehydrated cham). The pedialyte will help restore nutrients and rehydrate. SOme people give it strait, some mix half and half with water. Dribble the pedialyte into her mouth with a needleless syringe.
After that I would suggest placing her back in her egg laying chamber and give her complete privacy and quiet.
Tomorrow get her to a vet, unless her symptoms cleared up over night. Her symptoms sound very serious, life threatening.