A Time Intervention

"Headmistress McGonagall, hi, my name is Gwenora Ankh McGonagall-Granger and I am your daughter. I am also the daughter of Master Hermione Granger, whom I really hope is a Professor here because otherwise I've spoiled time for life". What do you do when an eleven-year-old child appears on the Sorting Ceremony claiming to be your daughter? A time travel and romance story.