I don't know if I can help you are not. The only info I have on the Fritts family is as follows:
John P. Fritts b 1 Oct 1803 in Culpeper Co marr Rebecca Chamblin dau of Ezekial Chamblin & unkown wife. Date of marr was 21 Apr 1831 in Loudoun Co. John P. also had a brother Jefferson Fritts b abt 1800. I have no info on him. John & Rebecca's children were:
Charles Ezekial b May 1852 marr Olive Amelia Derry
George J. b abt 1831 marr Elizabeth H. Cockrill
Mary b abt 1835 ( could this be your Mary? ) have no info on her.
Nelson b abt 1834 ( no info )
Jane b abt 1833 marr Zedekiah Kidwell
John b abt 1839 ( no info )
Sally Ann b abt 1843 marr Samuel R. Sagle
William b abt 1843 ( no info )
James H. b abt 1845 marr Elizabeth V. Grubb
Virginia ( Jenny ) b abt 1849 marr Samuel Lewis
Laura F. b abt 1853 marr Elias B. Lunceford
Maybe your Amanda could be sister to John P but I do not have her listed with him. Good luck in your search.
Ollie