I agree with you. I think people should be able to live their life as free as they want. This includes their sexual freedom. However that does not include when you have a stranger in your home with their own ideals of what is appropriate. People are free to decide the levels of nudity they are comfortable with but that should be limited to your family with your values. When you have someone working in your home you are imposing your values onto them.
I think it is inappropriate and even irregular to ask someone to accept inappropriate boundaries because of a job. You are forcing them to accept this in exchange for a paycheck. That is unfair. I would suggest that she not take the job if she is uncomfortable. If she takes it this will put her in a position where she is stuck in a job where she is forced to accept behavior that is very uncomfortable.
I would keep looking. This situation probably will never happen again. The "good" pay may be a way to say I will pay you well if you accept my inappropriate expectations.
Please press accept; this is the only way I am compensated