Am I missing the place where the MOTHER says she doesn't want to live?
All I see is the spoiled child saying she doesn't want to be burdened with caring for her mother.
Instead of pulling the plug on momma, she could just off herself to end all of her obligations to anyone.
That's not what the story is saying...she's saying SHOULD SHE, THE DAUGHTER, become incapacitated, she wants to die. SHE doesn't want to be a burden to anyone.