Not a lawyer. When the female employee says she doesn't want to cause trouble, it just means that, if you are going to do something about this situation, then you better own it. Make this a problem between you and the employee who acted inappropriately. i.e. if/when he demonstrates understandable reasons for acting the way he did, you don't turn this around on her.
Consider that when a woman reports harassment and says "I don't want to cause trouble," it's coming from a lifetime of not having her experiences taken seriously and situations like this backfiring. Boys will be boys, you shouldn't be dressing like that, maybe you shouldn't have lead him on.. and then the woman reporting the harassment gets labeled as the troublemaker instead of the real perpetrator. Demonstrate that…
Or, because corporate culture almost everywhere can be summed up with the phrase "don't rock the boat", gender notwithstanding.
There's no need to prejudge every woman as a victim - certainly one you know nothing about other than a one paragraph story on HN.
This is what's called benevolent sexism.