Talk:Horse Play/@comment-24217346-20180429034418/@comment-4531340-20180429115300

Or in this specific case, I think it's more that Twilight has a super-close bond with Princess Celestia that Starlight doesn't, and so while Starlight has a reverence for Celestia (as demonstrated in an early scene in this episode), she's not afraid to do what she feels is right, even if it might hurt Celestia's feelings.