Could not locate Ardelia Coleman, Busta Paige or Nanny Epps in 1870 VA census.

Emma Paige Morse is listed as Black

I don't know if this could be the grandmother of Emma Paige Morse but I found another Emma Paige in the Freedmen's Bank Records:

Emma Paige PIN: 57258
b. 1847 Loudoun County, VA
d. before 10/2/1880
Burial: 10/2/1880, Lem Williams, undertaker
Bank Location: Washington D.C.
Application Date: 4/18/1873
Height/Complexion: brown
Remarks: Cover over mother father, brother's and

sister's names.
Occupation: Cooking
Children: Arthur, Albert