The lady in these two images is identified on the Library of Congress website as “Mrs. Sarah A. Dasher [….], Ga.” in the image on the left and “Sarah A. Dasher,” wife of the unidentified soldier in the other image.
According to the Library of Congress, her name comes from writing on the back of the case. Accordingly, it is most probable that Dasher is her married name, as it would be unlikely that the honorific, “Mrs.” would be used with her birth name.
Less like is that the name on the back of the photo on the right was her birth name and not her married name. If that were the case, a possible match might be Sarah A. Dasher, born July 1, 1819, who married James Wisenbaker October 16, 1837. James was born in 1809 and died in April, 1868, in Valdosta, Georgia. Sarah died in 1888. Her broken headstone bears the name Sarah Dasher, wife of Jam[es] Wisenb[aker]. However, Larry Anderson, in a comment below, states that photos of the couple in the possession of descendents bear no resemblance to the couple in these ambrotypes. (edited 11/4/2013)
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Title: Mrs. Sarah A. Dasher, […], Ga.
Medium: 1 photograph : sixth-plate ambrotype, hand-colored ; 9.3 x 8.1 cm (case)
Liljenquist Family Collection of Civil War Photographs; Ambrotype/Tintype photograph filing series; Library of Congress Prints and Photographs Division.
Record page for image is here.
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Title: Unidentified soldier in Confederate uniform and his wife, Sarah A. Dasher
Medium: 1 photograph : quarter-plate ambrotype, hand-colored ; 11.9 x 9.5 cm (case)
Liljenquist Family Collection of Civil War Photographs; Ambrotype/Tintype photograph filing series; Library of Congress Prints and Photographs Division.
Record page for image is here.
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The images at the beginning of this post were digitally edited to reduce effects of fading of the photos and to digitally fade the frame to make the photos stand out more.
Civil War Portrait 011