I have seen a few suggestions in answers to other questions about it. But when I look I can never find it.
If I have multiple cats in my home, how many litter boxes should I have?
I think "reprogramming" Beatrice is working, we're at 10 full days now of no peeing on the bed. I forgot to close the bedroom this morning while I was getting ready and all she did was play with her ball on it. :)
I did catch her yesterday trying to squat on the litter mat, and moved her to the box. She hasn't tried again yet, so fingers crossed... I'll probably put a trash bag under the litter mat jut to be sure anyway, though.