Tammy, try http://www.harpspectrum.org. It is a non-profit site that tries to educate students and other interested readers, about the harp. Nothing to buy, no required registration with personal information. Just interesting articles by professionals about the world of the harp. Your daughter will also learn new harp terms used in her music, in the Glossary on the site.
Try lyonhealy.com, harpmall.com,
Actually if you go to askjeeves.com, and type in “harp” you will get tons of websites. Most of those websites contain even more links to harp websites. Best of wishes! Tell your daughter we’re all rooting for her! Let her get involved with harp summer camps, that will help a ton! Email me if you have any other questions!