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The day after her debut, Amelia stated on twitter that she had no memory of the events of the debut. There is a distinct possibility that the Ame who debuted isn't our timeline's Ame and the one who did the debut stream sabotaged the original Ame's livestream marathon by knocking her out with sleeping pills and returned by herself through the portal to gaslight Ame into thinking this was actually her.
It's been stewing in my head for a while but I haven't found anything to discount this series of events.