Can Low ferritin of 9 b diet related in a female aged 35, vegetarian But does not have heavy bleeding.?

Absolutely. For most people, animal proteins are a main source of bioavailable iron. People eating a vegan or vegetarian diet should make sure that they are getting enough through eating plant sources high in iron or supplementing. Beans and dark green leafy vegetables are especially good sources of iron, eating foods rich in vitamin C or taking C along with iron supplements can aid absorption.
Iron deficiency anem. Ferritin is a protein that stores iron ,releases iron as needed. A vegetarian without any bleeding can absorb less iron/ ferritin . Factors those decrease iron absorption are calcium, soy protein, phytate in bran,oat etc.The best advice to see primary care to check the GI tract for ocult blood. You need also thorough gyn exam as well.