All of a sudden one day, one of my level 4s was unable to kip-cast horizontal. I chalked it up to a bad day because the weeks before she could make 5 in a row on each bar and 5 routines no problem. But now it's been a couple weeks and she still can't get it. Her kips are slower and her casts are tiny. I've tried both drills and spotting as well as games and contests and nothing is helping. She didn't fall or watch a fall. I don't know what is causing it and I don't know how to fix it. Any ideas?