Marcella McGonagall goes back in time accidentally using her mother’s time turner during the final battle - some fly death eater spell sends you stumbling back into 1977. Stuck in time to live out the rest of the life, there is no longer Baby Marcella, only you take her place aged. Stuck in an unfamiliar time, trying to correct the mistakes in the final battle and start from scratch. From friendships… maybe more… to mother-daughter relationships.