Tsk, tsk, tsk, Skittles. I know you're the light of Mommy's life, but that's taking it a little too far.
See, they can go anywhere. Usually you'll find them in the one place you were 100% sure they wouldn't be.
I might suggest going through your home and looking for openings like this she might get into that you wouldn't want her to nest in, and block them up somehow. Might be safer.
What is being described about her nipples sounds very much like what Deja Vu was like very close to her time. The day before she gave birth she was nesting like crazy, in and out of every closet, nook and cranny, very restless. When she was ready to give birth, though, she also would not leave my side. She was on the sofa with me when I saw her first discharge, I got up to get some things I had ready, and she followed me. I tried to put her in the box, she wouldn't stay, and followed me. I finally had to just put a towel on the sofa, sit on the floor next to her and wait. The first two came right on the heels of each other about 5 minutes later (I think they were twins), and within 30 minutes she had all 5.
First 3 were a breeze. I had to help a little with the last 2. I think they came so fast it exhausted her. She got them half out, and flopped back. Each time she tried to lift her head up to lean over, she flopped back down. So I just helped by gently pulling the baby the rest of the way out, and put it to her head. She took over, and the 5th was the same.
When I knew she was done, I put them all in the box, and there they stayed for the next 3 weeks.