Birthday gift ideas for teen girl easy ten points?

I know you have 7 of your own ideas for Mitzi but if she loves to shop I would suggest buying her a voucher for one of her favourites shops? That could be anything from 5,10,15,20 - 50 pounds - however generous your feeling? Lol, for Stella I would maybe recommend a cheap cute bag filled with a few small gifts, some chocolates, pair of earrings & some knee high socks? xx