A Universe Away (a Supergirl/The 100 AU crossover)

Raven Reyes, a brilliant mechanic (character from The 100) is searching for another planet to call home for her and her friends. The only space pod around capable of doing what she sets out to do is only big enough for one passenger. So she sets out alone on this quest. While on her journey, she accidentally slips into a wormhole that brings her back in time, to before the earth was consumed by nuclear weapons. There, she is welcomed by Agent Alex Danvers of the Department of Extranormal Operations (a character from Supergirl).
Raven is at first frantic and desperate to get back to her time to help save her friends. But as time passes, she realizes that she has an opportunity to change the lives of everyone that she has ever known and loved. Will she take that opportunity, or let fate unfold the way it was always meant to?
Meanwhile, she develops strong feelings for Alex, who returns those feelings. Will this affect how they both proceed?