poop?

[Skeet]

I was cleaning the water dish this morning and lifted up Jezzy's hide and she had three rocks in the hide with her. They were white with with a little yellow and rock solid, and had no smell. Is that poop or just urates? She's hasn't eaten yet since i've had her, and i'm worried that she isn't drinking. I've put her head in the water and she refuses. She did eat 2 week ago today(the day before i got her)