You shouldn't cancel on your family members.
Arna is a loner and is invited to her sister's anniversary and is at home deliberating on whether to attend.
Arna wants to call her sister with an answer.
Arna says she'll go but admits her desire to be alone.
Arna tells her sister that she doesn't feel comfortable attending.
Arna bonds with her sister and they compromise.
Arna hears less often from her sister and misses the social contact.