Anemia workup?

I have a 40-year-old healthy woman with mild normocytic anemia found on routine examination – Hb is 9.5, MCV 80. She is asymptomatic except for maybe a little tiredness, with no history of heavy periods, gastro symptoms, chronic disease, or significant blood loss. Iron studies, B12, and folate are normal, as are renal and liver function tests. Celiac antibodies are negative, and  gastroscopy& colonoscopy showed no abnormalities, no hemolytic signs in lab. I am considering peripheral smear, reticulocyte count, because there is no clear cause. What else would you suggest I do?