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This is Dr. Diego, experienced in Internal Medicine, Pulmonary and Critical Care.
I understand your concerns. From the description you gave, it seems like your mother had a fall and this caused further medical complications. Usually for any patient in hospital they have an increased risk for blood clots specially after immobilization and surgery. Unfortunately in the case you described, the clot plus the other medical problems were severe and she passed away. The initial fall was the first event that started all these complication. I'm sorry for your loss. Let me know if you have any other questions. Please rate my answer.