Is she maybe gravid?

[Philminator]

the pictures don't do her justice but she's twice as fat as my 3 other garters of roughly the same length, she's very mellow, doesn't move, doesn't eat, just stays in a corner all day in a ball and never wants to bask to get some sun, she drinks and is active if I pick her up. If I closely look at her it seems like she's stretched out a bit as if she would of eaten but she hasn't in the 10 days I've had her.
PS. she really doesn't look gravid at all until I compare her to the others, oh well just thought I'd post it to see what you guys think.