While Pathfinder Ryder is in the outpost Paradise on Elaaden, they can assist Lexi in deducing the stasis pods on the Arks led to chemical inbalances in the bodies of some of the passengers, leading to the violent behavior of the Nexus Exiles who would plague the Heleus Cluster as scavengers and outlaws.
Lexi grew up on Omega, her mother was a dancer and her father was a bouncer. Lexi spent a lot of time patching up her father's injuries and discovered she was good at it which lead her parents to spend everything they had to get her an education to become a doctor, she lost both of them in a turf war at some point before she joined the Andromeda Initiative. She's also a good friend of Dr. Harry Carlyle, who she met at a medical convention on the Citadel. When her and Harry joined the Initiative he insisted that she come with him on the human ark Hyperion, which she was eligible for due to her knowledge of human anatomy.