A friend of mine asked Rav Sheinberg, Zatsal about accepting a job in an office where she felt uncomfortable for similar reasons. He told her not to take the job and he added, “Do you know how many girls get pregnant working in offices?”
So Health, even if it is something that happens all the time and has become accepted practice, it doesn’t make it okay. I don’t want to go into details here, but many terrible things have happened as a result of people doing things that had become accepted, but should have realized were problematic. People need to think and not assume that something is okay just because it has become accepted. Girls should rely on their gut instincts when it comes to tznius and not allow themselves to be put in situations where they are uncomfortable. Too often, girls feel like they have to repress their feelings in order to go along with others’ opinions.
I definitely agree with everyone who wrote that she should ask a Rav immediately. Either that, or just go with your guy instincts and don’t take the job. Honestly, I’ve never understood why it’s considered acceptable for a man to have a female secretary or assistant!