She is much more serious than her boyfriend Omid, but loves him deeply and is concerned for the safety of the group.

Lee's Group that you’re in, come across a hanging petroleum tank truck on-top of a bridge blocking the train tracks. They then spot Christa and Omid on the bridge above when Omid comments on Kenny's persistent shouting.

You climb up the station ladder, Christa see’s you climb up.

”Huh, another survivor. A young one..”