By 1851, she was married to a Valentine (or is it a Vantine?) and living in Owasco, Cayuga Co., NY.
From Ronny Bodine:
In the probate of her father's estate in 1851 she was named Martina Valentine of Owasco. Stephen Valentine was buried in Owasco Rural Cemetery, Cayuga County.
1850 Owasco, Cayuga County: Stephen C. Valentine 34 NY cooper, Martina 38 NY, Sarah J. Vantine10 MI.
1860 Owasco, Cayuga County: Stephen C. Valentine 45 NY farmer, Martina 45, Sarah J. Vantine 20 MI.
1870 Owasco, Cayuga County: Stephen C. Valentine 47 NY Proprietor of toll road, Sarah J. 29 MI, Mary W. 11 NY.
1880 Owasco, Cayuga County: Stephen Valentine 63 NY, Sarah J. 38 wife, Henry V. Emmons 22 NY son-in-law, Mary A. Emmons 20 NY daughter, Carrie Bodine 12 NY adopted daughter, Nellie V. Emmons 1 NY niece.