Is it possible childcare use their own disposables on her during the day because that's what they prefer? Just a thought.

Otherwise, maybe she's too busy to wee? I know Riv won't poop while we're out, he's too busy doing other things.

Riv drinks water like it's going out of fashion, but if you're concerned, perhaps you could add a bit of cordial to Bilb's water? I used to add just enough cordial to add a different taste, and now I just put in a drop of whatever I'm having while he's watching if he feels he needs to have what I'm having.