Ah, my Erin bugged out when she reverted her form. Her head keeps animating back and forth, lol. Now I realize she was probably always bugged (She's been in Knight form for like 10 hours through many heals). Apparently she was supposed to revert back into her normal form as I thought. When I went to have sex with her with her portrait bugged like that, she appeared in her normal form for the first time since she evolved, now she's back to Knight and won't devolve from restoration again...
Seems like if you heal before she sees combat or something, it turns off the bonus stats and she stays in Knight form forever? I did get some errors after.
I'm also stuck at a point in the story