Not a vampire in sight, but how about the Betsy-Tacy books, especially the high school books (#5-8).
If she likes mysteries, Peter Abrahams's three Echo Falls mysteries are fun, with a 13-year old heroine.
I suggest adding a lot of public domain classics--
Dracula, since she likes vampires; and titles like
Little Women,
Secret Garden,
Black Beauty,
Anne of Green Gables, etc. Check out the
Children's Bookshelf at Project Gutenberg.