I work every day with teens. A 9p or similar pieced blocks may be too "old school" unless she's into that. Ask her favorite colors and maybe ask her what her "fantasy bedroom" would look like. If she asks why either be honest and tell her you want to make her a personal useful gift, or that you want to know her better and learning her tastes is one way to accomplish that. If it were me I'd find a focus fabric that reflects her tastes do a series of borders reflecting colors in the main fabric and back it with flannel to cozy it up. Definitely put a made with love label on- harder to be careless with it, and send it with prayers that the love and concern it's made with will soak in. Just me, good thoughts your way.