My dd has longish hair and we are having a terrible time trying to keep her hair in a pony. By the end of a practice the rubber band has slide down and the hair starts to be loose around her face. Her hair is to her upper back and its very smooth. We have tried the scruchi brand no-slip rubber bands and even wearing 2 rubber bands at a time. Both of these help a little but neither solves the problem. Any sugguestions?