Answer:
After some kids make fun of her new outfit, she decides that she can't possibly go out in those clothes, then she realizes she enjoys movies and showing off new clothes, whether or not along with the grandmother. She shows the kids that she is proud of her gifts from her grandma, later gently telling her that they should go shopping together for new clothes and skip the movies.
Explanation:
Through argumentation, demonstration of confidence and a lot of good will, Justine succeeds at both changing her priorities and not hurting her grandmother's feelings.