It is implied that the long haired girl has already been replaced by the mimic by the time of the inspection. The tied up one is the real girl.So I get the implication the mimic is trying to replace her but the last 3 panels are confusing me what does it mean it'll be right behind her and why is the last shot her standing there and like not leaving or something what am I missing?
Huh, what I got was that it was the short girl that tied it up, there was that odd turned on line and then she stayed behind, followed by the happily ever after note, I thought she was going to "play" with the mimic.It is implied that the long haired girl has already been replaced by the mimic by the time of the inspection. The tied up one is the real girl.
The last shot is Aine walking towards the bottom of the panel (she's taking a break first), while the tied up girl dragged towards the top of the panel (after disposing the girl, the mimic will follow Aine taking a break).
Congratulations! Your Mimic evolved into a Doppelganger!Mimic got promoted to doppelganger.