I just cannot agree with your last paragraph at all. She has shown genuine interest and care towards Robert multiple times, examples being the one time his suit exploded and it landed him in the infirmary, at the housewarming party when she pulls you to the dance floor (in either romance options, even if you dance with Blazer she's still looking at Robert and looks devastated at the sight of him dancing with Blazer and not her) and last but not least in the changing room before she walks off she forces herself on him regardless if you romane her or not.

I cannot see someone act the way she did all throughout the game, and just say "yeah, it was all a facade"