Twilight will fix it

I like to think about Princess Celestia not like if she is a kind sun goddess, but a powerful, smart and insidous ruler. Sure she knows much more than other ponies, her power is ingredible and she's at least one thousand year old, so i have something like head-canon or a theory, where Celestia like to play with ponies to have fun. Like when she invited Discord on a gala and laughed on his jokes about Twilight in canon series)

I really really REALLY want to know more about her and Luna's past.