She lied repeatedly to cover up her true condition.
The rough reality represented by Stanley is seductive, he is young, strong, full of desire, he always exposes all the dreams of idealism, just like Blanche can't adapt to reality, Stella loves reality, Craving for reality, she needs beasts to satisfy her desires. Because she is a symbol of continuation of life, she wants to create new life for desire, so she appears in the image of a pregnant woman. And Blanche is going to die.
Blanche is a thorough idealist, an authentic romantic, she pursues spiritual perfection, and has a strong desire for poetry, art, and the fusion of soul. She attempts to adapt and conquer the rough and brutal reality represented by Stanley with her aristocratic grace and frustration, and tries to lead her sister, who has become a slave of desire, to a noble spiritual realm.
Blanche's words at the end of the film are impressive: Whoever you are, I can only rely on well-meaning strangers.
Idealism depends on the goodness of people to survive. Beauty, art, romance... must die in a world full of realistic desires.
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