Final answer:
Helen said 'Hello' to Atticus before she collapsed, symbolizing the overwhelming grief she felt in that moment.
Step-by-step explanation:
When Helen saw Atticus in her yard, before collapsing, she only had time to say 'Hello' to him. This brief interaction, followed by her sudden collapse, symbolizes the crushing weight of the grief Helen carries following the tragic news delivered by Atticus. The gravity of the situation is captured through the vivid simile described by Dill, likening her collapse to being stepped on by a giant, as if she were nothing more than an ant—underscoring her vulnerability and the severity of the injustice she and her family face.