Perverts in New Jersey

I am asking this for another person. A 20 year old takes a summer live-in nanny/babysitter job in Northern New Jersey.  Her female employer offers her alcohol multiple times to which the nanny says she does not drink. On one occasion, the nanny did take the alcohol. She tells me it was one vodka martini that she tried but did not drink and one Miller Lite bottle.

The nanny wakes up a few hours later and she is completely naked with her female employer who is sleeping. They are in the home theater of the house which has a sofa set up that is "like a large square bed". The nanny gets her clothes and retreats silently to her room. She feels disgusted but has no memory of what happened. She feels some pain in her vaginal area but has no idea why.

The next morning the nanny says everything was as if nothing ever happened. She reported that she felt sick and nauseous most of the day. When the father comes back from his business trip, things continue as normal. She is alone with him for one second in the laundry room when he says to her, "I guess I missed all the fun here while I was in St. Louis. I don't like to be left out." That totally creeped her out but no one has said anything since. four more days have passed.

I told her she just needs to get out of the house, even make an excuse and return home. She says she is afraid that they will say gross things about her. I told her they shouldn't, because she isn't of age to drink and regardless of who you are with, you have to be present enough to consent to sexual activity. My friend just wants to keep going and ignore all of this. I know she is embarrassed, but she's a 20 year old girl! I think whatever did happen was sinister! She's paid under the table so she doesn't have any rights.  Or does she?

What would you do if this was your best friend?