Normal life "before"MistLight used to be a human from the human world. She went to Canterlot High and was friends with Rainbow Dash, Pinkie Pie, Apple Jack, Rarity, and Fluttershy (but not as much as they were friends with each other). She was also friends with Scootaloo, Apple Bloom, and Sweetie Belle. Derpy Hooves was her BFF. She liked life there. Until Sunset Shimmers came along. She drove her friends apart and took over the school.
The picture on here is her as a human. Here's the game I used: http://www.starsue.net/game/Equestria_Girls_Creator.html
But her hair isn't really accurate.