John, I see that Nova Weller's profile has two managers - Nova and someone named Alice Rice. Do you know Alice and is she a family member? You can contact her to make the needed corrections or you can ask her to add you to the trusted list so that you can do it.
You may also want to write to firstname.lastname@example.org about the problem of Nova not remembering her password. It would be better, of course, if she wrote to them herself. If Lynn is not a WikiTree member, it might also be a good idea - if she's willing and interested - for her to join and become manager of her mother's profile. Nova might also like to make Lynn manager of all profiles on her watchlist and close her own account, allowing Lynn to take over the activities for her.