Help!

I have an unusual dilemma and would like some advice on what to do. Abby will not come out of her room during nap time, or in the morning when she wakes up for anything. Yes, this is great, but it has its downside. For example, I was trying to take a nap during this daily quiet time (since Abby rarely actually sleeps so I can't really call it nap time) when I kept getting woken up by Abby crying over the monitor which I had next to me. I heard the following: "Waaaaaahhh...I need to go potty...waaaaaaahhh!" and on and on. I have told this girl repeatedly that she can come out of her room if 1) She needs me, 2) She needs to go potty, or 3) If she's scared/bored/lonely. So pretty much, she has permission to come out any time. But she refuses. And I can't figure out why. When I got her to go potty we had a little talk and I could not get out of her why she wouldn't come out and go potty. Or at least why she wouldn't come out, get me and make me take her potty. All I got was, "Because I just don't want to". I asked if she was afraid I would get mad, or send her back to her room or anything and she wouldn't answer. So because of this, we're going to have to buy another monitor to get Molly into her own room. I used to think Abby was pretty self-sufficient, but now she has me wondering about that. Any ideas??