*Molly was considered stuck-up and entitled by the other women in camp, especially Karen, mainly due to her disdain for others and her refusal to do any work inside or outside of camp. Molly had made a point of saying she's not interested in chores or what she perceives as lowly work; when Arthur asks if she'd like to join the other girls in cleaning around the camp, she responds with "I'm nobody's servant girl, Mr. Morgan." This attitude is also reinforced by the fact that she is never seen doing work around camp, unlike the other girls who can sometimes be found embroidering, doing laundry, or other chores. It is unclear if the men in camp share a similar opinion of her, the only exception being Sean, who is unimpressed with her attitude and high-class background, calling her a "snotty nosed little West Briton" on one occasion.

Additionally, Molly also has characteristics of vanity and narcissism; she can often be found primping herself in her compact mirror, wears various forms of makeup such as lipstick, and takes pride in her appearance. She may also be superstitious, as she asks Arthur whether her grandmother was right in saying that her broken mirror means seven years of bad luck, before asking him to get a new pocket mirror for her.

Molly's mental state declines throughout the game, seemingly due to a combination of Dutch's neglect, the indifference of the other gang members, and the fear of the encroaching law enforcement. As such she becomes increasingly unwilling to socialize with others, often saying: "I need to be alone" or "I'm not much company" to Arthur if he tries to converse with her. Arthur will say on some occasions that he thinks Molly is "losing it". After Kieran Duffy and Sean are both killed, she becomes visibly hysterical and asks Arthur "How is any of this okay?"

She becomes somewhat paranoid about others talking negatively about her. In one instance she can be heard saying things such as: "them out there, they're all laughin' at me", for example. She also believes that the gang disregards her, which is evident in the way that Dutch, Arthur, and Uncle do on various occasions in cutscenes. Molly at one point confronts and accuses Karen of talking about her behind her back, instigating a fight which results in her slapping Karen, and Karen retaliating by punching her in the face. Karen makes a point of saying "Dutch or no Dutch", she will kill Molly if she gets physical again.

However, Dutch seemingly losing interest in Molly is the biggest cause of Molly's deteriorating mental state. There will be more and more instances of them fighting as time goes on, often with Molly accusing Dutch of sleeping with other women behind her back. Molly at one point begs Abigail for advice on their relationship and Abigail point blank states that she believes Molly is "sweet" but "not stupid" and that she should realize that Dutch does not love her, at least "not the way you want to be loved", insinuating that she believes Dutch is only interested in sex. This upsets Molly quite a bit who tries to tell Abigail it's "not like that", but Abigail retorts with "It is like that." Although Abigail is brutally honest, she does express several times through the confrontation that she does not wish to see Molly "make a fool of herself" and tells her to "take care of herself", but this does not seem to leave an impression on Molly who gets frustrated and runs away. At the beginning of "An Honest Mistake", Molly even tries to approach Arthur regarding Dutch, but is interrupted before she can speak.

At the party held after Jack is rescued Molly will attempt to approach Dutch and ask him to talk and will be harshly turned away, resulting in her running away into Shady Belle and not joining in the festivities. The deterioration of her relationship with Dutch is also the reason she ultimately has a meltdown and is killed.*