Rosalyn P. Marshall appears in MySims Stranded as the headmistress off the students in the Flintsims affiliation. On a field trip to Dr. F's lab before they came to the island, Liberty missed her friend, Sylvia, so she teleported everyone to where Sylvia was. As everyone else became un-civilized, Rosalyn stayed as the serious headmistress and made sure everyone got there education. She secretly enjoys free time so she can visit her grandson, Tim Sweet, though. Her role is the same as Helen's.