In Chapter 8, how did Grandmother feel when she left the party?

Grandma was disappointed and angry at father. She stormed out of the house and headed home.

'Ashamed!' she called out before she left. 'That a son of mine should be—'
'A patriot,' cried Father, who perhaps had never learned the rule about not interrupting your mother.
'A patriot indeed!' she cried out. 'The people you have to dinner in this house. Why, it makes me sick. And to see you in that uniform makes me want to tear the eyes from my head!' she added before storming out of the house and slamming the door behind her.