It sounds like Claire is in a bit of a dilemma! Based on what you've shared, Claire seems distressed after a conversation with Miss Larson, likely about a poor grade or performance on a test. Miss Larson sticks to her no-extra-credit policy, reminding Claire that she has time to improve her grade by doing better on future assignments.

Claire, however, seems overwhelmed by the situation and is probably thinking about how someone—perhaps her parents—are going to react ("totally going to flip"). As Claire walks home, her internal worry grows, feeling uncertain about how to handle the situation.

It's a relatable moment, as many students feel this pressure when they don't perform as expected. The important thing for Claire is to stay calm, focus on doing better moving forward, and figure out how to communicate the situation to whoever might be upset.