A partial change sounds like a good plan. I still haven't established which is her loo corner, so I'll clean all the corners and mix in some fresh bedding to stop any mankiness. I hope she will like exploring the bath- I brought a little toy that doesn't fit in her cage so maybe she can use it in there.
If the experiment is a success, she'll be spending a bit of time in there every few days to give her a runaround