A mom calls the local Girl Scouts council to ask about a troop for her 8 year old daughter. They ask what school the girl attends. It is a private school, a bit of a distance from her home. The council says there is no troop for her. The only troops nearby her home are in public schools, and only open to girls who attend the school. Since this girl's school does not have a troop, she is out of luck.
So, these girls spend all day together in school, then get together in Girl Scouts after school. No one else is allowed in. So I guess my homeschooled girl couldn't get into a "regular" troop, even if I was able to get her to the after-school meetings in the school building. Nope. Have to attend the school.
Compare with the Boy Scouts, who have troops in various places, meeting at various times. Boys choose the troop that they like best, or that has meetings at the best time for them, or at the best location. Public school, private school, homeschool - come on in!
And you thought the Girl Scouts were all about diversity.
Actually this year they are all about "going green!" But then isn't everyone?