Looking for Martha E Smith Milton FL 1860 S

I DO NOT KNOW MARTHA'S MAIDEN NAME. SHE WAS MARRIED TO MORRIS SMITH ABOUT 1850-55 IN PROBABLY SANTA ROSA OR ESCAMBIA CO. FL. SHE HAD SIX CHILDREN & DIED IN 1869.MY GREAT GRANDMOTHER REBECCA WAS ONE OF THE DAUGHTERS. REBECCA SMITH THAT MARRIED JOHN WESLEY COBB & LIVED IN BALDWIN COUNTY, AL. I AM TRYING TO IDENTIFY MARTHA SMITHS FAMILY LINE.