My best guess is the portrait was taken for her 70th Birthday, usually a milestone birthday. The exact date of that birthday would have been March 19, 1948. It seemed that if it was Margaret’s and Bob Graham’s 30th wedding anniversary, there would be a portrait with both of them.
The white corsage with what appears to be a small rose might swing the date choice to a particular Mother’s Day, but it also might have been part of the 70th birthday celebration with her husband and children.
Margaret Graham gave this portrait to her sister Muriel who lived in Chicago. Later, the Leonhardt family gave this portrait to Dave Jordan in the late 1980s. Muriel Leonhardt is Margaret's sister.
If you would like to add information about this picture, please contact Dave Jordan, a 1x g-grandson of James and Margaret Jordan. The Picture Reference Number is 19480319a1; Digitized Negative: 161-09.