I have a 17 year old girl. The theme right now seems to be BRIGHT! There is a fabric at Wal-mart called Crazy Daisy. It as the name indicates is big bright colored daisies. She used this to make curtains for her room.
Peace signs, hearts, and smiley faces seem to go over well as long as they are BRIGHT.
I'm sure she will appreciated whatever you send her. She must be hurting and knowing someone cares is always good at times like that.