There's a couple of options here- Bill managed to keep up the 'innocent muse' act long enough for Ford to give birth, or the betrayal was revealed but Ford was still trying to figure out how to get the portal shut down, either with or without Stan there. She ages more 'normally' on Earth, so I don't know if there would be a way for her to actually see and remember Ciford, since there's no way it could have continued for years on end without Ford ending up dead in one way or another.

Assuming Bill could have used some kind of magic to age her up after birth, though, either could be interesting- in the first, she knows Bill on the mindscape/from him being able to jump right into her mind, while also knowing he can possess Ford, and that's just normal to her, including the bleeding- a regrettable side-effect to the limitations of trying to stuff an energy being inside of a meat-puppet. The cracks start to show, though, and the betrayal's all the worse when it shatters the happiness they thought they had.

In the second, it's the kind of thing Ford warns her excessively about, in between bouts of paranoia that she'll hurt him- he can't manage to get unicorn hair in his dimension, so he's probably not able to fully protect her from Bill invading her mind too, but if he can, she's warned to interact with Ciford as little as possible. Plug her eyes, bar the door, and never, ever shake his hand. That thing isn't him, and she cannot forget that- always be on the watch, don't even fully trust the only person she knows.

It gives her nightmares, every glimpse of Papa with glowing yellow eyes and a too-wide toothy grin and blood dripping on her things to stain them forever, but at least she's in good company.