Geass her. It was the sword that did it, but Lelouch made her stop, she became a mortal finally. Also, I believe that V.V. died, or was on the verge of death, because since Charles became an immortal that meant that V.V. had someone to fill his position and become mortal again, like the Nun and C.C. Plus Bigdeath, that would be a huge cop-out. While she will get her memories back, obviously, I'm thinking if she interacts with Anya or something, it wont be through those means, maybe this time Lelouch has to kiss her? Who knows.