That is great that the move worked. You did right by closing her in for a bit, so this limited her options.

I have spare bedrooms, so litter boxes are in those, with a gate across to keep the dogs out. I also have 8 boxes in the cellar; the way this house is set up, it is easy to leave the cellar door open. However once I move to the other house, that is going to be awkward, and I haven't figured it out yet.

I originally kept all the boxes upstairs in the spare bedrooms. They all moved downstairs when I had the hardwood floors refinished a few years back; the cats had to stay down there with the door closed, so the crew could work. After, it just seemed easier to leave them, and just bring a few upstairs. There will be 2 spare bedrooms in the other house, so I may just keep all upstairs again and see how that works. Once I move, I won't need 12 boxes for 7 cats, either. I have that many just now because I leave for 4 days 3 nights at a time to work on the other house. Time will tell.

Keeping it in the bathroom presents this question: what if someone is in there for an extended time (bath, shower, etc) and kitty has to go? You are setting things up so cat has no option but to find another place. Not a good situation, IMO.