Porn is not different from Hollywood when it comes to people's looks. A different haircut, a new tattoo, a breast augmentation, etc. changes the way the consumer looks at an actor or actress. Her looks before were very androgynous, and that works for a niche group of people.
I disagree that her body type is the whole reason she's niche, it's a combination of things: hair, body, voice, style. It's not coincidence that she started to book more mainstream porn just as she changed her looks. Companies care about numbers. probably someone told her that her numbers were low and that she could be more popular with a more feminine look, and she did it. Perception is everything in a business like this.
Take the example of actresses that have a more "barely legal" look. When they get old, they change to a more "milf" look and the public changes accordingly. Sometimes they get more popular, but usually they leave the industry or their popularity dwindles.