Reptile Dripper

I'm a vet tech and worked for long time with a private Reptile breeder. I know my stuff when it comes to reptiles, but my Bearded defies all the odds, and everything I know. She's in a 20 long tank, has the correct liting, and a dripper, but she's never gone after her food or wanted to eat much. She just stays curled up in the corner of the tank? What should I do? Please help
She hasn't grown very much since I got her, but she seems healthy otherwise. She does eat at some point, but it takes her a couple days (sometimes a week) just to eat like 2-3 dozen.

There's no chance it a parasite, and the light is a sun glow, 65 watt? It's whatever the breeder gave me, and he's got 20+ years of experience!?