How is the Title A doll's House relevant to the play?

The whole play takes place in one room. Until the last act, Nora is in every scene; she never seems to leave the room. The action of the play all comes to her. She is literally trapped in domestic comfort. She is given her “housekeeping” money by Helmer as though she is a doll in a doll's house. The play suggests that this treatment is condescending and not an appropriate way to treat one’s wife.