Dengue leads to decresed platelet count
, an important adjunct for internal clotting mechanism. count less than 50,000 is critical and if less than 20000, may lead to spontaneous l internal bleeding
like brain hemorrhages.
gastro intestinal bleed leads to blackish stool called malena as may be in your mother's case.
monitor platelet count, avoid any NSAID like ibuprofen, diclofenac
blood glucose level is also high...consult your doctor for the same.
wish you good luck