My 4-year-old daughter was potty trained at 2 or maybe 2 1/2. At night she had quite a few dry nights, but not all were perfect; so she has worn a pull-up while sleeping. During the day we never had any issues though. Recently she has reverted. She now pees her pants over and over. She has not pooped them yet and she'll still go to the potty for that. But she no longer goes pee on the toilet.
We have had to put her back in diapers. She seems excited by this and is now happily using this to go in. Again, not poop - just pee. She says she doesn't know why she does it.
We cannot figure out if some event caused this or why this would be. A doctor wasn't any help. How might we try and correct this behavior? What could be the underlying cause?
[Edit] - Though I marked an answer below I thought I'd update this question with the ended outcome. She got worse after the post and began hitting mom and other children, yelling, and throwing tantrums. This was only during daycare. For this reason we believe it was all a ploy for attention. Being that babies get the most attention this could explain the diapers.
We believe she simply doesn't want to share mom with other children in the home daycare. We put her into external daycare 2 days per week. We hated to do it. She behaves there just fine and is improving at home from it.