With the hubs new commercial out, who wants to sit through a full 5 seconds before seeing their favorite ponies? Not me. I am impatient, so I made this video. 

What can we infer from this? Obviously, at the beginning, Twilight Sparkle spilled all of Celestia's secrets. Eventually, Celestia found out. She ended up killing Twilight Sparkle and Rainbow Dash, shortly after the element of loyalty tried to protect her. Rarity can clearly be seen cowering in the second scene, so this must be true.