To what extend is Blanche a complex character in 'A Streetcar Named Desire'?

Stella’s older sister, who was a high school English teacher in Laurel, Mississippi, until she was forced to leave her post. Blanche is a loquacious and fragile woman around the age of thirty. After losing Belle Reve, the DuBois family home, Blanche arrives in New Orleans at the Kowalski apartment and eventually reveals that she is completely destitute. Though she has strong sexual urges and has had many lovers, she puts on the airs of a woman who has never known indignity. She avoids reality, preferring to live in her own imagination. As the play progresses, Blanche’s instability grows along with her misfortune. Stanley sees through Blanche and finds out the details of her past, destroying her relationship with his friend Mitch. Stanley also destroys what’s left of Blanche by raping her and then having her committed to an insane asylum.