a G3P3 woman who has rectal bleeding and severe microcytic hypochromic anemia with slightly elevated leukocyte. on the 40th day she has hematuria n TNTC RBC in urine. then on 80th day of hospitalization she has breathing difficulties and found to have solid diffuse lesion on the left lung. on the 100th day she dies. Wat could b the cause of her death?

Summarized question: What causes death after rectal bleeding and microcytic hypochromic anemia?