My niece is 31 years of age, mother of one child. Investigation of her blood reveals that she is a patent of anisopoikilocytosis having a few tear drop cells. Haemoglobin-8.7, PCV-29.8%, Platelets-201000, Ferritin-5.83. How can you explain the cause and remedy of her disease

Summarized question: What causes anisopoikilocytosis?