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If she had expressed a desire not to be kept alive artificially if she was not able to maintain her own care and sustenance, then the withholding of nutrients is in keeping with her advanced health care directive. She was allowed to pass due to the fact that she was unable to sustain her own life, presumably in accordance with her wishes.
But even if there was some question about negligence or wrongful death, the statute of limitations is 3 years in MI for a cause of action for injury to person and 2 years for malpractice. So as of tomorrow, the time to potentially take any action would expire if there was some proof that the medical care providers were not just following her directives.