I'm 19 and omg I remember when I was growing, they hurt so bad! I'm sure the vest can be painful for her at times. The only things I can think of is maybe lowering the pressure on the vest or even buying some kind of padded bra just to use the vest with, because the bra could keep her supported and put some extra cushion between her and the vest. I hope any of this helps! But she'll grow out of it soon!