User blog comment:Alishepard/Who is your least favorite Squadmate in the series?/@comment-4118072-20120806201701/@comment-3228423-20120806212924

She never questioned me or held any hostility after Mars, but that's probably because I'm always paragon and stuff during my playthroughs.

Her response to you is probably either A: It's how you interact with her during those cutscenes, or B: She's the type of person that has to make sure of a person's motives before being able to trust them.