Yes because the Nephthys outside the mirror made an agreement with Osiris to get her pregnant with a child (ofc we know that the child is Anubis) but lie to Seth that Anubis is Seth's child so that everyone is happy. Remember this Nephthys believes that she's in love with Osiris. All her original memories of loving Seth are replaced with loving Osiris
The girl herself is real, though. It's her memories that are fake, but she's a real person (like, a real patient that got lobotomized (as in, who got her brain f***cked over with) completely without her permision. Unlike the one inside the mirror (who's only the "embodiment" of her lost memories), the one outside is the real Nephthys (as in, not an impostor pretending to e her, or a copy of her created with magic, but herself), just with a completely erased and rewritten memory. Lobotomized. That's why I said, "girl's been completely screwed over".
Yeah, but apparently that's still confusing for some people because in other comments there are plenty of readers reading us and asking if the one outside is an impostor or a clone... At this point, I think the safest to stop fellow readers' ongoing confusion is to call her a mind-control victim, a patient, a person under a spell, or whatever..............
Can it be Seth and neph and not Seth and Horus