What's a good graduation gift for my cousin that is 17 years old for a girl?

Me and my cousin is 7 or 8 years apart and I want to know what is a good gift for her. When I graduation she don't give me nothing that's like damn frfr and i not really bother by that plus I got to go to my moms friend daughter graduation to so, I do not want to spend a lot of money like either but my cousin I don't she going to school or what she going to do but I do know that she like lip gloss and she talk about I want a case for her iPhone and all that… What will be a nice simple gift and how about a gift for my moms friend daughter is going to nice school?

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