I love a good backstabbing (Patreon)

Cozy Glow: Ooh... I love a good backstabbing!   MLP, Season Nine, Frenemies

One of the creepier characters to come out of Friendship is Magic is the little pegasus filly Cozy Glow.  I don't know if we'll ever get her backstory, but I am curious what series of events sent her down the path she's on now.