This would be the mission page for Young Women with a section on the bottom or side for posts about activities and such. This would apply the same to other auxiliaries, but I see a static but brief intro on the page that describes the mission of the Young Women maybe including the Young Women’s Values so as the girls have activities and want to share with non-member friends there would be an introduction to the Church that is of interest to someone that age and shares in a way the youth would be comfortable directing their friends there. There could be additional links for more detailed info about the Young Women of our ward and links to applicable content on the Churches website(s).
This would be great to provide a news story type wrap up of events like Girls Camp. Great care would be taken to protect our youth so details of an article that shows photos of an individual youth with identifying information could be restricted to verified users that are members of the ward. This could be done as a members only post or one with sections that are suppressed for visitors outside the ward membership. Group or candid shots with no identifying information about individuals could be evaluated as members only or not by the relevant auxiliary leaders.