If she doesn't know how to tie ties (and I sure as heck don't), go to http://solidcolorneckties.com/ and get a boy's zipper tie. Boys' ties are generally shorter, so they look better on women, plus zipper ties are DA BOMB.
If she would like fun bow ties, you've GOT to go to New People in Japantown. In their shop on the third floor, and also in Black Peace Now on the fourth, they've got GREAT bow ties - from traditional to more schoolgirl style. They've also got great traditional ties in the New People store, but the prices are pretty high.