If somebody is being harrassed by coworkers at work, during work hours, about a work related practice I am not sure the question should be "does the boss care" but "is the boss liable". There are plenty of bosses who don't care about safety violations, sexual harrassmeny threats, etc. Not caring is a pretty lousy yardstick.
I am sure that when peoplr have faced sexual or racial harrassment and intimidation in the wlrkplace the argument that they are an adult and can take care of themselves has been trotted out. Perhaps one of her reasons for staying quiet right now is that it seems to be.2 agsinst 1 with nobody to verify their treatment of her.