Having found her marriage certificate and noticed the church was in Little Stanmore, England, I then checked out her birth. Finding one at Great Stanmore, I looked at a map to find out how close these two towns were or maybe in the 20 years between birth and marriage, the towns might have separated. As I find more siblings, I will add their information here.
Here is her baptism certificate (births were not required to be registered until the 1830’s).
Parents: Margaret and Richard HEARN
Date of baptism: 27 October 1816
Source Citation: London Metropolitan Archives, Great Stanmore St John the Evangelist, Register of Baptism, dro/014/a/01, Item 008