I headcanon that, for some reason, Deneb was born with the power to manipulate time and space. It came in handy when helping invent the compass and the spaceship, and she used it on herself to stop her aging process and any diseases she caught from spreading.
I’m not sure why she took the space-time compass if she already had that power? Although the disease part would explain how she hasn’t been a carrier for the Great Plague herself (although she also could have just avoided that time period completely, since. time travel).







