I'm not sure you can decouple her public persona from her profession. If she were to insist on being non-binary, exactly what non-binary clothes would she model? Also, there almost certainly are some challenges she faced being in that industry, that other people don't have to deal with, like the clothing companies not wanting her as a spokesperson because their executives barely understand transgender, and probably haven't even heard of anything non-binary. Being a model isn't an industry where you can be yourself, it's about being the person that fits some designer or company's image. The clothes you saw her modeling were not generally ones she chose, they were chosen for her. This may have partially been a career move, as was possibly being ambiguous in her previous interviews. That profession is all about image, after all.
I don't fault her for any of this though, her public persona is her livelihood, as it is with any model.