[As she should. Discord was a real monster back in the day. Who knows how Equestria could have turned out if Twilight and her friends failed for good and their friendship was over?]

I'm glad too. He did come back a while ago, but Twilight and her friends were able to stop him with the elements.

[She's very sure the reason why the seal broke is because of the whole Nightmare Moon incident, and because she and Luna are no longer connected with the elements of harmony.]