Once the Dawnguard questline is complete, she can be asked about curing her Vampirism. Should she agree, she will leave to see Falion for a cure. She will return to Fort Dawnguard after a few days, cured, yet she will still use the same dialog as though she were still a vampire and will still wear her hood when outdoors.The Dragonborn may permanently lose the option to get her cured by choosing the wrong dialog option. Every time she is asked about getting cured she says "I'm not talking about this with you anymore."