She's TOO smart for her own good

We have been trying to potty train Mckenna lately. Honestly, she could have potty trained 6 months or more ago, she just didn't want to. I had this brilliant idea, she loves princesses, if I get her princess underwear... So Saturday I bought her princess underwear (unwear to her). She was quite impressed and wanted to put them on immediately. I told her that princesses don't like to get all wet so she needs to potty in the big girl toilet. She did great, no accidents all day. Then we get to night time. I told her that she had to wear a diaper to bed and that if she could keep her diaper dry, she could wear underwear to bed. Kellie put the diaper on her but unfortunately left the underwear on her bed. She woke up yelling, "I clean, I clean." I realized that she had underwear on and it was dry. I then saw that her diaper was dry. "Great!" I thought. Then I noticed that her bed was soaking wet. I know exactly what she did. She removed her diaper so that it would remain dry, pottied in the bed and whala, woke up clean. The good news is that her diaper was dry this morning but I'm still not ready for unwear at night. LOL!!!