She might’ve been having a stroke which affected her decision making
Most likely.
Not necessarily a full blown stroke. My dad also had congestive heart disease, and in the last week of his life, he became erratic and combative with my oldest brother for no reason. He was already in the hospital, but they had to put Dad in restraints. The doctors said that this was likely caused by a lack of oxygen getting through to his brain. It was in the same vein as a stroke, but not a TIA. His heart was filled with fluid most of the time those last days. At least we were able to gather around him to say goodbye.