Reptar is a pretty dragon and looks healthy as well. Her head cramped against the wall is not star gazing, just one of the manu curios poses they get in sand even will sleep that way . Crazy, I know ! Still, if you're concerned about ADV you can have her tested by Tracie, she works with the main lab/clinic that are working on a cure.
As far as the vet tech fishing the poo sample from the garbage, that was and is a problem because it DOES open up the possibility that it was cross infected . Too bad that happened, they should not have charged you for that test IMO.
Reptar is walking O.K, dragging her belly might be from her shedding there, it doesn't look like a problem either way.