It's really not that hard to understand: She once was a member of an organization. She left that organization. After she left that organization, the members

It's really not that hard to understand: She once was a member of an organization. She left that organization. After she left that organization, the members (no longer including her) signed a letter. She didn't sign it, since she was no longer a member. So how is it OK that she was named as a signatory? I don't know what's going on with people who use the term "these kids".