I hope she gets better real soon!

There has been lots and lots of great advice so far, but I just wanted to add one thing - it may be an idea to buy her a brand new litter tray now, and another one when she gets better, so that she has a "fresh" start, and no longer associates it with pain and uncomfortable urination.

Although her little problem is annoying, it will be an excellent indicator in the future if the problem returns - as soon as she starts peeing on the couch again take her to the vet!

Lots of hugs 'n' headbumps to the Lovely Luna from the recently ill Pixel