It influences her to remain committed to her POV.
She sees that by staying committed to Helping, she is doing the right thing.
Assuming her Problem Element is "Help" ... if she were to move to "Hinder" she would stop helping people, right? And she understands that helping the Thrombeys is writing them out of their inheritance.
Benoit even points out to her how she didn't give in to them and play by their rules.
It's easier to see from the other perspective, from the IC that changes. It's presented by Ransom in that final scene. He goes from being cool and calm and in control the entire film... to exploding at Marta, admitting his guilt openly, and finally stabbing her in a furious rage. Losing control. Being uncontrolled. Same element as the family, too, in the OS (i think). They go from trying to control everything from the interviews, to the inheritance, and devolve into insanity--storming the car, losing their shit against Marta.. everything for them spirals out of control.