A slave named Sarah

Looking for the DOYLE slaves of Burwell Lee of Pittsylvania Co, Virgina. All mulatto. My 2x Greatgrandmother, Sarah Doyle was born about 1840 in Virginia. Her children were; Parris, Emmerson, Mildred, Eliza, Peter Lee, Mary Elizabeth and Mattie. I have been told that Burwell's wife Mildred  may have owned Sarah prior to her marriage to Burwell.