What good for the kingdom?
Are you talking when her people were hungry and living surrounded by dirt and she was partying surrounded by luxury? She even dresses like Maria Antonieta and bakes pies!
Or when she decided to run away and hide (twice) while mewmans were being conquered and killed?
Oh, and my favourite, when she orchestated two terrorist attacks against thousands of civilians to kick Eclipsa out of the throne even though Eclipsa herself, the villagers and Star ASKED ABOUT HER OPINION OF THE ISSUE and she said she was going to respect Star's order (even though she could say no at any moment, peacefuly)?
Moon was the worst kind of queen, the one who doesn't realize how shitty she is and covers her lies and selfishness with the lie "it's for their own good"
Star did a good thing ending the age of queens, except for Jushtin and Comet they were all terrible leaders.