She's still capable of fitting completely under her current ones but it no longer lays flat against the substrate - it rides up enough that I can sometimes see her sides while she's in there and tends to drag it with her. Right now she's just got plastic bowls for hides. I have some that are bigger, they're the tip-proof dog bowl kind, with a space for her to slide through to curl up in.

I attached a picture of her current hide and the ones I have that are bigger. On the left (green) is the current hide size, the middle (black) is the bigger hide from the top and on the right (red) is the bigger hide from the bottom. The red and black bowls identical are in every way except color.