the wrong end of the telescope

I thought the same thing! Well, not quite; I thought she was playing a long game, and had been planning to turn on him all along, because she wouldn't have even gotten to that situation otherwise.

Instead, she just looks dismayed, because it's the 60's an the writers have seen Mad Men and know what gender relations were like then, somehow completely forgetting that their character is a powerful telepath and also Emma Frost. Even if you assume a complete personality transplant, even if she's completely conditioned by her era, being a telepath would have some effect on how she acts and sees the world. Someone who can make people respect her just by telling them to isn't going to be a Little Woman archtype. (And maybe she's wary of him, and playing nice, but there was absolutely no indication of any of that.)

I'm pretty sure the only way to make sense of Emma is that she was the mastermind all along, and Shaw only thought it was his plan. girl_wonder reminded me of a similar-ish arc in the actual comics, so yeah, possibly I'm just going to assume the scene where she lifts one perfect eyebrow in the end and you realize what's been happening all along stayed on the editing room floor. (That's also the only thing that would make sense of Charles and Erik just leaving her with the defenseless CIA humans, and of her cutting the window and peering out at their defenseless selves and then, apparently, going to sleep until the end of the movie. Clearly her nefarious plan was to get into the CIA building all along.)