Thanks to Loyola Library Digital Collection (thanks Wikipedia for pointing me there) I was able to confirm that my aunt did indeed graduate from Immaculata High School in Chicago nine years before my mother did. Seraphia Walsh was in the class of 1930, and is mentioned in many articles and school documents. Her interest in art was well established.

Using advanced search, I was able to find this very early treasure, drawn for a school program when she was 15 and a half years old.  Her calligraphy was always outstanding. This program shows her interest in art and calligraphy. Even at 15, she thought to create key letters as musical notes. I was thrilled beyond belief to find a piece from her youth. Her name is credited at the bottom, highlighted as part of my search result!