» Sat Aug 11, 2012 1:15 am
I found this on the skyrim wikia:
Once the Dawnguard questline is complete, she can be asked about curing her Vampirism. Should she agree, she will leave to see http://elderscrolls.wikia.com/wiki/Falion for a cure. She will return to Fort Dawnguard after a few days, cured, however will still exhibit certain traits of her previous vampirism:
Hopefully this helps.