Since you actually SAW Leila peeing on the floor, I would have a urinalysis done. I have found that it is better NOT to assume.

If it turns out to be 100% behavioral, then you need to ask yourself "How would I feel if I put her outside to live?"

Also, for the time being (while company is there) since she is definitely peeing, I would separate HER in the cat run. It would also allow you to determine if someone else is also peeing inappropriately.