It's possible that Harriet Kalloch died after giving birth to Susan J. in 1838. Two years later her husband William married Harriet Newell Morrell.
Year: 1860; Census Place: Cape Elizabeth, Cumberland, Maine; Page: 28; Family History Library Film: 803437
Year: 1870; Census Place: Cape Elizabeth, Cumberland, Maine; Roll: M593_539; Page: 154B; Family History Library Film: 552038
Residence Post Office: Portland
Year: 1860; Census Place: Cape Elizabeth, Cumberland, Maine; Page: 28; Family History Library Film: 803437
Residence Post Office: Portland
Year: 1870; Census Place: Cape Elizabeth, Cumberland, Maine; Roll: M593_539; Page: 154B; Family History Library Film: 552038