Her listing in the 1850 census says 2 years old, but both the family bible and tombstone list her birth as 1849, and that is what she used as well, so it may be that it was just an error on the part of the census taker.
Married John Campbell (d. 1866) in May 1862 and then Samuel Lewis Kirk (1845-1910 shortened from Kirkpatrick) on 20 Jun 1870 in Fayette Co.