Kirsten, been there and done that! Onyx suddenly developed a peeing problem in January, so I've been dealing with this for 11 months. Aside from vet visits to try to fix this problem, here's what I've been doing at home:

1) I am actually rug-less right now, and will continue to be until this problem stops, if ever.

2) I put pillows or blankets on furniture that were problem spots. It stopped the peeing in those places.

3) I have taken a "take-the-dog-out approach", only with a cat. Meaning, I used to let my dogs outside several times a day (before they went to the RB that is!) so I had to take the effort to go to the door, let them out, and let them back in. Both my girls are gone now, but the little time I spent doing that is time that I pick up Onyx and take her down to the litterbox. I stay until she goes, then I coo "good girl, Onyx" and let her go off to play.

4) I put a litterbox in the closet in my bedroom. I did not want to do this but I gave in. Onyx now sleeps in the bedroom with me with door shut so if she needs to go potty, she knows where that litterbox is and uses it.

Basically, I think the areas that Luna is targeting are areas you will need to circumvent somehow - blankets, pillows or removal of items. Take her down to the litterbox frequently. If peeing at night is a problem, you may want to confine her to an area with a litterbox at her disposal.

I know how frustrating this is !! Onyx is nearly 13 and we went 12 years without a single peeing incident that I know of, then BAM! Everywhere !! While it can be associated with bladder issues, I do firmly believe it can be a behavorial issue as well.

Hope this helps!
Andrea