Your mum is probably suffering from acute leukemia, malignant process that affects bone marrow and replace its normal cells (from which red and white blood cells and platelets develop) with higher numbers of immature white blood cells. Due to this, there is a luck of platelets in her blood steam, condition known as thrombocitopenia. With this condition she is pron to bleedings which can be fatal if they occur in brain (her situation is more difficult because she is diabetic and diabetic people already have problems with coagulation).
Transfusions with red blood cells and platelets is an initial treatment of supportive and symptomatic character.
Hope I helped!

THANK YOU FOR YOUR HELP ...