Susie's Mom is Susie's Mother. She was seen in one strip from the waist down (looking like Calvin's mother from the waist-down). And she was referenced by Susie in another. And in yet another she called Calvin's Mom because Calvin dropped a snowball on her head from the top of a tree as stupendous man. She appeared when Calvin was trying to smash Susie with a giant snowball. When he is caught he quickly says he is selling the snowballs.