Jane: You know, we're right back where we started. When I was on the stage you had to depend on me for everything. Even the food you ate came from me. Now you have to depend on me for your food again. So, you see, we're right back where we started.
Blanche: Why are you doing this to me? Why?
Jane: Doing what?
Blanche: Making me afraid to eat. Trying to make me starve myself.
Jane: Don't be silly. If you starve you die.
Jane: Nothing wrong with it. You're just a neurotic, Blanche. You know that, you're just a neurotic.
Blanche: You said this last month, she's been a lot worst. Do you think she knows?
Elvira Stitt: About selling the house? How could she? You don't have anything in writing.
Blanche: We're sisters, Elvira. We know each other very well.
Answer: Blanche's fate is left ambiguous, so it's impossible to say if she survived or not. It is not revealed in the original novel. Jane would most likely be institutionalized, seeing as she is suffering a complete break from reality at the end of the film.