Psamtic fully believes her parents were nobles in Osirion and definitely acts the part. In reality, her parents were rich thugs (a la mafia), and she was taught to act and talk as she did so as to not anger or scare away potential clients for her parents. Due to their connections, though, Psamtic's parents were incredibly rich, so she did, in fact, live a lavish life. Just, one built by crime, not by birthright.
Psamtic smells doors before opening them. If a door smells of honey, lavender, or fresh wood, she almost can't resist opening the door, even if she believes trouble to be the other way. If the door smells of something more sinister like fire, stag beetles, or blood, she tries to open any OTHER doors with the same conviction.
Psamtic solidly believes she is better than any around her, including venture captains. This HAS gotten her into trouble, but she definitely hasn't learned yet.
When Psamtic rages or is under the effect of a mutagen (especially when BOTH), her personality morphs entirely into something more akin to an Azata. In this state of mind, she refers to herself as Winter's Chill, and carries herself more as somebody willing to be an idiot for the greater good. She charges headfirst into traps that can't be avoided, hoping to trigger them for the group as a whole, immediately attacks anything that is notably evil, and consistently offers any of her equipment to others (even her full plate, though Psamtic's personality usually takes over to ensure the plan never goes through).