Men Speaking Around Me, Not to Me
I don't know what the issue is in her case, but a high percentage of my problems with men boil down to "I'd hit that!"
If that's her problem, either they are trying to avoid having a visible boner in public or being accused of sexual harassment for inadequately hiding their blushing, stammering and Freudian Slips of the lip or trying to avoid stupid drama with their girlfriend or wife
If she's young and naturally pretty, it might help to intentionally tone things down at work, possibly even intentionally being on the dowdy side.
One very successful career woman I knew who had real power in her twenties wore extremely conservative, covered up suits and called them "my armor." She also consistently put her long hair up at work.
She didn't have a great face but had a fantastic body and very long hair. She made sure neither fact was apparent at work.
Do note that super conservative suits were appropriate for the office she worked in and will not be the correct solution in all cases.
No, dressing more conservatively will not 100 percent prevent the problem but may help men blush and stammer less around her, enough to be willing to speak TO her instead of ABOUT her as if she's not 5 feet away.