Katie, I've never seen her eating litter, so I don't think I have a problem there.

Sandie, the lady at ARF said not to worry and just keep an eye on her. So that's what I think I'll do too.
Yes, I know, I need to post more pictures of her. Last week (or Aug. 5th) at the vets she weighed in at a whole 4 pounds!! She's getting so big!

Claudia, I thought Taz would have the same problem when he was at his heaviest (21.5 lbs), but he's never had an issue. A couple of times his big bottom must have been out of the box because he urinated on the mat in front of the box.

Thanks for the replies, ladies. And I'll try to get some pix and post them tomorrow.