I would bet dollars to donuts she does not have a UTI or any other health related issue. Most of the time, it is strictly behavioral. The thread one or two below this talks about this issue, as well as this one site: www.catinfo.org/?link=litterbox

I have tried to post it as a link half a dozen times and it doesn't work for me.

Read up on that...see if you can address it that way. Watch what you clean it with. Many products on the market simply do not work. I only use OdorXit. It works.