Thank you kindly for playing! And thank you for pointing out various bugs which I have now fixed.
I'm afraid that Maura's blue moon charm serves no special purpose other than as a symbol of friendship (and moreover, a symbol of the impact friendship has had on her own life and growth as a person). I know her appearance is a bit out of the blue, but it's a remnant of the original plan for this game which sadly got scrapped very early on in development. Maybe someday we'll see what this much older, less bratty summoner is up to.