Hb is low. Iron deficiency is there. Is is not normal to have anemia in young healthy female. Thought most common cause is nutritional deficiency it should not be taken granted for all. proper cause of anemia particularly gi causes has to rules out in your since u have gi symptoms. Ibs is disease of exclusion have you done ugi scopy and colonoscopy. If based on only symptoms you are telling ibs then I may not be right.