A friend of Kirsten, Anna and Lisbeth. She has curly brown hair and a "squinched-up" face like a sleeping puppy, and attends Powderkeg School with them. Her older brother is John and she has a younger one year old cousin being raised as a sister. Her family initially moved to Minnesota from Boston four years ago (thus prior to Kirsten's arrival). She's worked on a quilt before so when Miss Winston is not there to guide them she helps. The year before the events of Happy Birthday, Kirsten! (in 1854), her Aunt Sadie gave birth to twins; Sadie and one twin died. The Stewarts took the baby to raise as their own and calls her Mary's little sister; the child is too young to know about her biological mother.