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If mother was "medically incompetent" due to her physical condition or if she was heavily medicated, then she could file a suit under a breach of contract and fraud claim to set aside the transfer as the product of undue influence and allege that she lacked the legal capacity to enter into a contract (i.e. sign the deed over).
She would need to file the suit, and then have her doctors testify that she was medically incompetent so as to not be able to comprehend what she was doing when she signed the deed. The judge can then void the deed and return ownership to mother.