[There was another version of her husband, which meant that Coraline was telling the truth... so logically, she should have expected the Other her.

That didn't stop it from being a shock.]

You're-

[Another me, the one with buttons for eyes, the evil witch that trapped them? (If this was real, then maybe Coraline was telling the truth about that, too.) More importantly, she's the one that tried to hurt her daughter.

'Hostility in the air' would be an understatement right now.]

Coraline is not your concern. I'm her real mother, and that's what she needs. Not some button-eyed impostor that tried to eat her.