It's wrong to lie about your life.
Sammy has been invited to dinner by her friend Claire, but she isn't interested in going.
Sammy wants to stay home.
Sammy tells Claire that she isn't up for dinner tonight.
Sammy tells Claire that she can't go to dinner because she's caring for her sick grandmother.
Claire tells Sammy that it's okay, and they make plans for later in the month.
Claire cooks a pot of soup and brings it to Sammy's house, only to discover she never had a sick grandmother.