I'm not going to say "never," but IIRC, DCC social media hasn't highlighted "Sideline Sweetheart" before... They will post who the Game Day Girl is, but we usually find out who the SLS is from the girl's personal social media. I find it interesting that this is the first one that they've posted.
eta: I just went back and looked through IG, fb and twitter and I didn't see anything about SLS prior to Molly. On Ashlee's IG, she posted a video (when she was SLS) from a friend/fan that was at the game. Also, Savannah posted a IG Story (no longer visible) about her being the SLS at a game.