It's possible for her to be human again because it's not long time ago that she died. That means if she get her human form than she will be at the same age again. It'll only affect those vampires who are very old and lived for decades like Yoon Soo or Geurim, where the one will probably die and the other will be old. And I think she has the right to know about the possibility to be human again. At the end she should've the chance to choose.