Answer:
She felt betrayed by her own half sister.
Explanation:
The story of Cam and Tam is based from a Vietnamese fairy tale, that is quite similar to the story of Cinderella and her step sisters.
In the story, Tam was asked by her step mother to go and fish with her half sister. As their father had already, and her new step mother only cares about Cam, Tam did everything to please her and not make her angry. She caught a lot of fish but was betrayed by Cam while she was unaware. And the added pressure was that whoever returns empty handed was to be punished. So, she is worried and also dread her stepmother's anger that is bound to be on her now that she has no more fish.
