Tyrrell decided to lead Cruz's first-grade Cub Scout troop last fall. "It was a very community-oriented group of kids," she said. "They made me treasurer to get the books in order ... I found some discrepancies -- things that didn't add up."
She said she met with local representatives over the financial matters, but afterwards, the scout master called her and said, "We have to ask you to resign."
"Everyone locally knew I was gay," said Tyrell. "I was devastated. I cried for two days. Those kids were my family. All my parents were devastated."
Patty Morgan, 35, whose 7-year-old son Jordan was in Troop 109 told ABCNews.com, "I was not even aware they had a gay policy. It was very emotional for me."
Morgan also helped Tyrrell with troop activities: field trips and community service work at a soup kitchen and with the Salvation Army.
"I was very upset -- she was my friend and for me, this is personal," said Morgan, who with other troop parents had participated in local protests. "I hope that it ends up changing the policy for the Boy Scouts. That's what we're all hoping for."
Tyrrell said she told her troop parents that she wasn't "abandoning" their children. "It was not my choice," she said. "I didn't want them to think I left them. I had made them a promise to follow these kids to Eagle Scout. Now I can't."
Change.org has been instrumental in other campaigns, most notably the Trayvon Martin case, which also caught the nation's attention and resulted in the arrest of George Zimmerman for the fatal shooting of the 14-year-old.