You may want to use pedialyte instead of water to moisten the pellets, it will help better hydrate her.
With healthy beardies supplemental heat isn't necessary unless the temps drop below 65 at night but with this situation it probably isn't a bad idea. Just make sure to turn the heater off during the day so she has a cool area to thermoregulate.
Do you have a light at both ends of the tank? If so I'd definitely only have the heat at one end. She does need a cool area in her tank. If you have to get a dimmer switch and add the supplemental heat with the UVB bulb then so be it. Or maybe even try a lower wattage bulb.
FYI, you may not have 10 days to wait for a vet visit. I know that may sound blunt but when these guys go down hill they go quick. Is there any way you can get her in sooner?
Also, I had to hand feed my little guy for about 2 months before he started on his own. In addition the pellets you may want to pick up some Acidipholiz . It is a probiotic that will help get some good gut flora into her digestive system and may stimulate her appetite. It has done great things for a lot of beardies. I'll put a link at the bottom of this post for you.
If you want to try to get something out of the breeder you can threaten a letter to the Better Business Bureau as well as the animal control office in your area. Selling a tiny, sick baby then refusing to help out could be considered as animal cruelty, at least that's what I'd indicate to them. Also, it is their responsibility to replace the light that broke and I believe the Better Business Bureau may get involved with contacting them if you tell them the whole story. You can also threaten to write you local newspaper about the situation. Make them worry about their name a little. Explain to them it would be in their best interest to make things right or you will see to it this story is heard by many.
If it's a well known breeder I'd start tainting their name in private emails to people you know as well as the BOI. Just be completely truthful in your explanation. If you don't know what the BOI is email me and I'll tell you.
Another thing. You indicated she falls asleep when in your hand. Try to handle her only when you have to right now. I think the biggest problem is her stress level. Is there alot of traffic where she sits? Maybe cover up three sides of the 10 gallon to help make it seem like a smaller, more comfy and secure place to live.
ProBiotic Lind
Good luck with her!!
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Rob Talkington