Putting on my "I wonder how she came up with that" cap for a moment:
If porn robotics advances to such a stage where a pornbot will be physically as close to a woman* as makes no difference, then men* who get used to treating pornbots as objects, will start treating other women* (who look like the pornbots) as objects too.
That's a bit fallacious, since you could make the same argument for any type of humanoid robot, no matter what it's function. There are valid concerns in that direction, many of which explored in, for example, Asimov's 'spacer' worlds. But that is all based on massive 'what ifs'. Who knows, maybe humanoid robots that are undistinguishable from humans will make us all a bit more polite to each other.
Back in the real world, where pornbots are going to be easily distinguishable from humans for (guesstimate) centuries through behaviour alone, maybe it will work the other way, and use of pornbots that are readily identifiable as objects will lead to less objectification of humans.
Either way, my money is on these things reducing the 'back alley' cheap prostitution (the vast majority, including the more exploited women which I guess is what this lady should be more concerned about), while high-class escort services wouldn't be affected.
*potentially with genders reversed/mixed, but I'm pretty sure this is the main 'use-case'