My LO 3 in April and only wees on the potty with her pants and trousers pulled up instead of down...if I try and sit her on bare bummed she screams the place down. She doesn't like being wet though. Am at a loss. Am following Jo Frost Confident Toddler Care book advice about letting them feel uncomfortable for a bit so they feel motivated not to repeat but not really working for her. How do I get her to sit on the potty bare bummed?