The Shopping Bag Lady

The Shopping Bag Lady is a 1975 American short film directed by Bert Salzman and starring Mildred Dunnock.
Plot summary.
A shopping-bag lady, Annie Lewis (Mildred Dunnock), is viewed as a homeless nobody by two thoughtless teenage girls. After Annie is picked up by the police due to a misunderstanding, one of the girls (Emily) learns to see her as a human being after looking through Annie's possessions (which Emily has salvaged). As a result Emily is more compassionate towards her grandmother, with whom she lives.