Should I engage in a challenging discussion with my friend?

I, a 50-year-old woman, have close friendships with three remarkable women in their 60s and 70s, and their support means the world to me. However, I need to have a tough conversation with Caitlin, who is 72, about her behavior and how it affects me, especially since we both attend several groups together. In one of our meetings, she has been engaging in behavior that could be emotionally harmful—specifically, she frequently crosstalks by offering advice directly to other members, which is against the group's rules. Although the members, a mix of men and women in their 50s to 70s, have discussed this issue, she has not changed her behavior. Since there isn't a designated leader in this group and we all take turns leading, this situation makes it harder to address. I worry that if we can't find a resolution or if she resents my approach, it could jeopardize my participation in these shared groups. There's a risk that I might lose my friendships if the others choose to side with her. Given these potential consequences, should I speak up about this issue?