"A Streetcar Named Desire" - How does scene 10 develop the audiences understanding of Blanche and Stellas relationship?

This scene of A Streetcar Named Desire effectively develops the understanding and perception that the audience have of Stella and Blanches' relationship, while using language and imagery to illustrate the tension between Blanche and Stella's husband Stanley.
"Stella is lying down in the bedroom. Her face is serene in the early morning sunlight." (Pg46) The description using stage directions presents a very picturesque scene surrounding Stella, however from previous knowledge we understand that Stella and Stanley have recently had an argument, which resulted in Stanley attacking Stella. The…