Joan could've belittled the girl for her ignorance. Others might have. Instead, she succinctly explained a brief overview of the situation, aware that someone of her age would be at a formative moment. Joan wanted to invite her in, not put her off.
"So you see why we have to march. We will march and march until someone listens and changes things to make them safer for the women of this country," Joan finished, a note of determination in her voice, the same sort of thing that had made some men follow her, and fight for her, and win.