I think I may have figured it out. I might be wrong but this is what I found. I think Mary is a sister to my 4th great grandmother, Elsey Harrison Summers.
Cuthbert Harrison (1796-1837) married Jemima Lowe (1800-1851). Their daughter Elsey (1821-1901) married Elijah Summers (1815-1884) and they had a son Robert Houston Summers which is my 2 great grandfather.
On the 1900 census it showed that Dessa Alward was living with her uncle George and his mother Mary. I haven't found out why though.
I will scan in the picture tomorrow. I have several other pictures that might be from this family. Do you happen to have any pictures scanned in of this family that I can compare mine too? Do you know of any others researching this family?