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It really depends on her taste, but generally people her age like practical stuff that matches their hobbies. If she's into creativity, some good drawing materials, a quality sketchbook or even a digital drawing tablet are worth it - I actually got one for my niece and she's glued to it. Now if she's more into sports, cool equipment for whatever sport she likes, some good headphones, or even a voucher to do something she's always wanted to do with friends works really well too.
But something tied to her hobbies is always a safe bet - if she likes sports like hockey or skating, something along those lines. If she's more into creative stuff, some beginner interior design kits could be cool too, like those decoration apps for tablets.
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