I certainly admire your choice of faerie tale to retell, and I do like your twist and voice. However, your characters don't seem to have much reason behind their actions. In order for the story to be as effective as possible, it seems to me that it's necessary for you to change what happens a bit more by giving the princesses the character that they lack in the original. Do they see salvation in her, because she won't marry one of them, or do they think that they can kill her by making her doomed to stay in the other realm forever? As the reader, I want to know!
Overall, though, a funny, entertaining story.

Haha this was hilarious! XD Well written!