Katrin's Reaction:
- Emotional State: Katrin feels insulted and hurt by Frank's behavior.
- Actions: She leaves the room and walks out onto the street.
- Internal Conflict: She questions why Frank is acting this way towards her and contemplates whether she should go to Prague, a place she has dreamed about for years.
- Later, at home, she grapples with whether to help Frank, who seems to be alone.
Summary: Following the argument with Frank, Katrin is deeply hurt and confused, leading her to withdraw and question the nature of their friendship and Frank's actions.