.Mariam and her friends probably attended teas, Proms, school dances and hops, and went to each other's houses to push the rugs back and play records and dance for hours. Young people went to the movies, which now had sound and color! People had telephones now and young people could easily call each other to talk and to arrange dates and social outings. It was a whole new "modern era".
Judge Fromberg, Mariam's Dad, had his office on Broad Street where he had his private law practice. He was also a Justice of the Peace. Did Mariam ever stop by to visit with her Father after school in the afternoons? Most people went to the Synagogue on Friday evenings, then home to eat supper. They probably had many friends and acquaintances from there. I read that Judge Fromberg's Father had helped establish their Synagogue in Charleston. 
Mariam might've enjoyed looking at the popular movie magazines of the day such as these: (magazines were only ten cents to a quarter back then!)
Vogue and Harper's Bazaar also got started in the 1920s.