She was addicted to Morphine.
Mrs. Dubose was a morphine addict, and she had been slowly dying from pain. However, Jem and Scout helped her live free of the addiction by reading to her every day. She died because she was a morphine addict.
Mrs. Dubose died of suffering many years of cancer. Before her doctor had told her she only had a few months to live, she decided she wanted to die free and not addicted to her morphine. So gradually every day when Jem and Scout came to read to her she had an alarm set that so every day when it went off her caretaker would give her a small dose of morphine. Gradually each day the clock went off later and eventually stopped, and that is when Mrs. Dubose had finally conquered her morphine addiction and was not dependent on it any more. It is never specifically stated how she dies, but we know she was told that she only had a few months to live, and that she was addicted to morphine. She was an elderly woman in a wheelchair who wanted to break herself of her addiction before she died. She did this and "died free." (See the end of Chapter 11).
She died in her home peacefully of old age as well as getting over a morphine addiction, she died clean.
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Mrs. Dubose is depicted as being sick due to her struggle with a long-standing morphine addiction. She is determined to overcome her addiction before passing away, showcasing her resilience and strength in the face of adversity.
She was addicted to Morphine and was trying to get off of it.
Mrs. Dubose was addicted to Morphine.
Mrs. Dubose suffers from "fits" when Jem and Scout visit her because she is addicted to morphine.
She was a morphine addict and stopped taking morphine. She is experiencing exceptionally bad withdrawal due to years of continued use and addiction.