Simple really....twenty meters isolates here from those she wishes to influence....it effectively silences her....unless she shows up with a megaphone.
As long as she does not interfere with clients, the women's "zone of access" is not affected.
You're negating your own argument... you want her closer so that she can be heard, but you claim that she won't be interfering. Well guess what... being heard IS interfering.
Freedom of speech and freedom of audience are not the same thing. You are not guaranteed the right to get into women's faces to have your opinion heard.