Talk:Princess Twilight Sparkle - Part 1/@comment-19871-20131117191744/@comment-24544571-20131118000659

Celestia didn't die. The overview of Castle-Mania (an episode after this) mentions Celestia sending Twilight and Spike to her old castle for research.

There's your proof. Wow, I didn't know subsequent episodes' overviews could spoil so much.