Arngrim's character grew in importance during the series (as did the roles of the entire Oleson family) as she served as a perfect antagonist to honest, tomboyish Laura Ingalls, played by Melissa Gilbert.
Arngrims karakter voksede i betydning i løbet af serien (og det gjorde hele familien Olesons roller), så hun har tjente som den perfekte modstander til den ærlige, drengede Laura Ingalls, der blev spillet af Melissa Gilbert.