My DD has developed a phobia of the bath since she vomited in bed one day and I gave her a bath after it. That was about a month or so ago now and I thought she'd get over this phobia. She has gotten better and will now actually get into the bath without too much convincing, but still absolutely screams when I wash her hair or even just wet it. She will not cooperate at all and makes it all 100 times worse with all of her thrashing and screaming. She has long hair and I need to wash it every 2 days or so. What can I do???