A compact mirror. You can get her name engraved on it. Maybe a super nice pen so she can write you a lovenote.
Giv eno jewelry it's such a cliché...<br />
think well about what she likes next to jewelry, make it something original...
Check out limogesjewelry.com - lots of inexpensive couples jewelry.<br />
Another idea is to buy her a movie she'd like to see, get a tub of popcorn and some candy, snuggle up under a blanket and watch it together!
Charm bracelet? Not the cheap kind though.