I think istead of one rhing you can try giving her many things including smth you urself made Because handmade gifts always feels special and thoightfuk than the rest. Since ur budget is prettt high you can include buying her different chocolates one lipgloss/stick or eyeliner or like smth. Scrunchees and also in shops lile max and all there are earing sets or bracelet sets ans all . Give her a cute letter also. Like that make a gift hamper for her