R.
Jewelry is always nice. Something personal, like a birthstone pendant or earrings or a charm of some activity she likes. If she has an ipod or iphone, and itunes card is nice too. If she is a typical 18 year old girl, a gift card to her favorite clothing store would be perfect. If she is heading out on her own soon, things like a coffee maker or a sandwich press are nice for a dorm or apartment. An electric fondue set is fun for chocolate and cheese and I can just imagine a bunch of giggling 18 year old girls making fondue and having a good time talking about boys;) Anyway, think fun and unexpected.