S.H.
What a nut! I had such a terrible experience with my girlscout troop leaders in 2-4 th grade that I quit and 30 years later I'm still disappointed. I used to go to boyscout meetings w/ my brother (M. was a leader) and those were so fun!
I would write her a letter about how bizarre her behavior is, about how it's not just about her and her child, about how girlscouts do sing and do other stuff, too and about how maybe she needs to change her perspective or step down. Stop apologizing!!! And CC that letter to the Girl Scouts of America. Seriously. She's ruining the experience of being a GS for so many people.
Good luck.