Rapidly decreasing sugar level, strokes, variable blood pressure, coughing, cold, foot swelling. Reason for death?

hi i just lost my aunt she was a sugar patient( from around 18 years) age approx 70 years these days her sugar level was decreasing rapidly which was causing strokes and she complaint about her blood pressure which was getting low or high sometimes she got cold and was also coughing due to cold and she had gastric problems too and there was swelling on her foot . we had her recent report just 9 hours before her death where her hemoglobin was 7 and high uric acid was traced. Around 4 am she was awake and at 4.45 am i found her dead with foaming mouth and cold hands. some are saying her kidneys failed due to high uric acid n long time high sugar and some says heart fail due to cold and low hemoglobin please tell why she left us so soon there wasn t any major problem she was looking so fine so we didn t hospitalized her