Great-Greatest Grandmother of Celestia

Twilight took careful aim at Celestia's current location. She  was going to make her pay. Twilight had sharpened her horn to the point where if even an atom of the tip touched you you'd get cut badly. Then Twilight folded her wings and dove directly into Celestia, sending guts flying everywhere, all over Luna, too. Teleporting back up, she charged down again while Luna cried in confusion and mourning. This time Luna exploded less violently because Twilight had not folded her wings and had just charged down, wings open. That was easy.

Next, Twilight took a train, undisguised, to the Crystal Empire. Twilight found Cadance on the deck, making an announcement. She disguised herself as a mini Nightmare Moon and rammed right into Cadance from up and behind, making her plot the most damaged part of her body.

She teleported out of sight and quickly undisguised, then teleported to the  train station. Since Twilight was the only Alicorn princess left, she had guards all over her room.

Simply as that, a wave of magic began to wash over Equestria, causing every single pony to glimmer with color. Twilight took over as overlord of the ponies, their savior.