Um, she loved his grossness.

"Oh, I love that," Annie said softly, her breath actually catching a little. Family was gonna hit her, in this context, the same way Mom had. "Our little family. I can't wait. You're going to be such a good dad."

She just had a feeling. No evidence whatsoever to back it up, save for the couple of times she'd been four years old for a weekend and he hadn't allowed her to die.