I believe you are talking about Louise's struggles regarding
her love for Captain Wallace and her feelings for her
In Chapter 11, the Captain's house is destroyed by a hurricane,
and he and Louise go to see the extent of the damages. Louise
reacts strongly when the Captain hugs her in the boat, thinking
she's falling in love with him. In the next two chapters, as
Louise struggles with her love for Captain Wallace, her grandmother
makes her feel worse by saying Louise is having an affair with
Louise's feelings toward her sister are also reflected in these
three chapters. Louise gets upset when Caroline, her sister, uses
her hand lotion and gets violent toward Caroline, reflecting
her bitterness and jealousy of her sister for so many years.
When Caroline suggests that Captain Wallace marry Trudy, Louise is
even angrier at her.
These chapters are the culmination of Louise's hatred and
bitterness toward Caroline. Louise feels she's been denied the
love and attention of her parents and friends because of her
sister. Her grandmother's cruelty only makes her resentment
stronger. Her friend, Call, and Captain Wallace even seem to like
Caroline more than Louise. It's only after Caroline goes away to
school that Louise begins to understand the actions of the people
around her. With the Captain's help, she learns how destructive
her feelings will be if she can't come to terms with them.