Well, that settles it. Ammonia would be an epic fail, although covering it up would give her something better to do than pester Thunder. The orange-based cleaner sounds like a good idea. Heck, I’d use EZ-Off if it wouldn’t destroy the fence in the process...lol...
If it’s really a “she,” I need to do something drastic pretty quickly or I’ll have to deal with a box, a drive I don’t want, and a lot of tears on the way.
If it IS a she, and she is spraying, it is probably because of a urinary/kidney problem. If so, your ability to help may be restricted by financial considerations as well as...what will happen to her when she is well?
I wish you Godspeed, in either case.