Already peeing the bed.

When Nate went to get Zoee up from her nap today he found that she had taken her diaper off and peed in her bed. Why would she do that? She has been doing strange things lately. The other day, she took her diaper off, walked into the laundry room, shut the door and peed on the floor. I just can't figure it out. I don't know if she is doing it on purpose because she knows when she has to go or if she just likes to play with her diaper and pull it off. I am stumped.