The Bath Tub Monster

I have no idea what is in the tub that I can't see but I am going to assume it is a monster..... Jadyn has just recently started HATING the tub. She is okay for a few minutes then she stands up and starts to FREAK OUT! She yells "Jadyn all done" and screams and cries. I have no idea what is wrong. She just says she is done and she means she is done. She usually still has shampoo in her hair at this point and I have to traumatize her even more because I have to rinse her hair. I really think Jadyn would rather I cut her leg off than give her a bath. I don't have any clue what she is afraid of so I can't help her to over come her fear. It doesn't seem to be the drain. She flips out before the draining part even starts. This too shall pass, right??