Because she fully predicted the development of her condition and knew that she would not be herself at all in the future, and the only way to change this outcome was to take medicine to commit suicide. Her decision to kill herself was deliberate, it was the most happy ending she could think of, and sadly, it was the last thing she could do for herself as Alice. Unfortunately, the suicide was interrupted and forgotten. Even if Alice watched that video next time, she would no longer be able to find those medicines, let alone have the mind to prepare them. Life is not always what one wants, and in the end, even the opportunity to kill himself is lost. But from another perspective, Alice's return to ignorance is at least less psychological than the sudden death to her family.
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