Actually, the answer is yes. The Girl Scouts has a rule allowing a transgendered child - meaning if the child identifies as a girl and the family treats him (her) as such, then yes, she can join the Girl Scouts.
Deborah Netburn of LA Times Nation Now blog has the story:
What does it take for an anatomical boy to be enough of a girl to join the Girl Scouts?
The question came up recently when 7-year-old Bobby Montoya -- a long-haired, Bratz-loving, biological boy -- asked his mother to sign him up for a Girl Scout troop near his Colorado home.
The troop leader said no. So Bobby's mom, Felisha Archuleta, went to the media -- telling a local television station that her son has loved "girl stuff" since he was 2, and that the troop leader's decision to reject him had left him devastated.
"I said, 'What's the big deal?' and she says, 'It doesn't matter how he looks, he has boy parts; he can't be a Girl Scout,' "Archuleta told Colorado's Channel 9 News.
But in fact, Girl Scouts of Colorado does allow people with boy parts to join its troops, as long as the child is truly transgendered -- meaning the child identifies as a girl, and the family identifies the child as a girl.
"We feel it is important to include all girls, so when a family says, 'This is my daughter and she wants to be a Girl Scout,' we are not going to question that," Rachelle Trujillo, vice president of communications for Girl Scouts of Colorado told The Times.