Fashion Jewelry Set

What to buy my boyfriend’s sister for Christmas?
She is fourteen years old and a freshman in high school. She likes fashion, makeup, and books. So far, I’ve bought her a makeup brush set. In the past, I have bought her jewelry and makeup. She recently started wearing headbands, but she has so many. Where can I get her a unique or vintage headband? Any other suggestions for gifts for her?
I don’t think I’d buy her something that she already has a lot of. But you do say she likes vintage, so maybe a vintage purse.
Indian Lakh Handmade Necklace Jewelry Earrings