Female no health problems, daigonised w/ autoimmune Hemolytic anemia, dies in heart hospital w/ blood clot .?

female no prior health problems, taking no medictions, no alcohol or drugs, diagonised w/ autoimmune hemolytic anemia. Taking to er, red blood cells count was 7.9 - transferd to heart hospital given blood an stabilized at reb 10. Was told she suffered a heart attack because of termendous loss of blood, mild stroke aswell. No blood was actuallyh lossed, but blood was eating own blood. Layed in hospital bed for 2 day, the nerver maged legs or put things on her legs for blood clots. Died from blood clot in leg. I think this should have never happened especially in a reknowed heart hospital. Does any body know anything about blood clots and if this a case of over sight or neglect. She leaves a loving close net family that is asking why? thank you very much