Aahhhh, I bet it's the walk!
That's an instant reward for her, regardless of whether she's being crated again right away after returning. It's soooo tough with this sort of situation, because you don't want her to suffer if she DOES have to go, and you DEFINITELY don't want her messing her crate again right away if she does.
Do you think it might help if you moved her to another crate right away, and washed hers without taking her out? Then you could switch her back and leave her for a bit before taking her out again. That way she's getting out and getting her walk, but only after she's been calm and all that. Also, it could be a good idea to start taking her out for walks in between, BEFORE she winds up peeing in her crate, just so you can give her a reward for being good. Kinda like starting crate training over again, regardless of how long she's "supposed" to be able to hold it for, since she's obviously fighting tooth & nail about it.