John, on second thought, Anafleda has an existence in popular genealogies, so, since she has a profile on WikiTree, I think it's helpful to people to be able to find her and see that we have termed her as Disproven Existence. That fulfills an important educational objective.
So I created a new Unknown Sachsen for Cerdic's sister and made her the mother of Wihtgar. Added Ancient Royals as the PM. Now all that's left to do on this one is to change Wihtgar's LNAB to Wessex. Or perhaps Jute.