I want to give my sister the most rock'n'ist Christmas present this year. I don't live with her any more since our parents split, so I have no clue as what to get this girl, by the way she is 14. I'm going to spend three days with her next week. I figure I might let her skip a day of school and both of us go present shopping for our family, but I want to make her present a surprise. 
Any ideas for the present or insights into the her mind would be helpful. Thanks.

Any ideas for the present or insights into the her mind would be helpful. Thanks.