She isn't terrified of being locked up with other crewmates. Considering that we all have our bad sides, I'd like to assume that everyone on the trip has something that they'd rather not have revealed about themselves. Most people are definitely not 100% friendly, and character depth may be the best way to go about it. She's not manipulative either, considering that again, it's typical that people like doing things for themselves and usually reach out to others if the reward proves lucrative. I think I'd rather have her be human instead of some fantastical type of character? In any case, I'll PM the rest and we'll go from there. 

edit: [@TTNoobs]