Marking her territory?

So, I tried putting the girls in their room together again for a nap. It's been months since I separated them because of all the poop they left for me when they were in there together. After about a week of cleaning it up, I cried for over an hour and called on friends for help. The solution, thank you Bro. Vandiver, one in each bathroom, stripped out of every single item and the water turned off and one, Abby (because she's the best behaved at naptime) in her room. Preparing for naps, takes about 20 minutes to make sure bathroom is clean and smells clean, move mattresses and quilts and all the essential preparation. So, I thought I'd try it together again. Well, no poop. But, I could smell urine. I smelt all the blankies and all the clothes and could not find it. Finally Sara helped me out. Abby, had peed a little in each corner of the room on the carpet. Why? Oh these girls. They're so cute but sheesh are they naughty!