Lip gloss and finger nail polish are also popular with teens. Watch for sales and put together a gift basket. Stay away from hair accessories and jewelry unless you know the teen very well.
Most teen girls love to write.
Give them journals to write in. A friend of mine gave my daughter a special journal and pen to write with. This journal quickly became my daughter's book of poems. She's been adding to her poems for several years now and will treasure this special journal forever. Stationery and stickers are also always welcome.