A pony with bat-like wings suddenly appeared in the sky. "Hello," she said and looked at the group. The pony landed near the pack, and said, "I'm Dupluna, your camp director. Feel free to ask me questions or get help !"
You're right. Luna does get underappreciated and it's true that Princess Celestia could've payed more attention to her feelings, and that might have even prevented her from banishing Luna (aka Nightmare moon) in the first place.
Thank you for those kind words, @Iforgotmybrain! Your idea for Luna mentoring the CMCs is also really good. I got hooked and tried finding fanfictions on this topic but I think nobody wrote one.