She doesn't seem to have much of an emotional response to what had happened. Was that the result of her trauma? Or was it just how she handled things?

Ralph tilts his head, "Could be. You mighta been too tricky for 'em and they had plenty else to deal with..." So, there was some kind of invasion, something had gotten in and wiped everybody but this one girl out.

"I'm glad you were able to survive."