My 3&1/2 RIR still lays a small, usually not quite oval egg 4-5 days a week. The shells are very fragile even though she eats oyster, eggshells & fermented feed. My biggest issue is that the yolk has a "strange" taste (not from foods, as my other eggs are fine) and the albumen is partly runny / partly thick & globular. She is a happy, healthy hen who eats and poops normally. No external parasites and no signs of internal. Her eggs have been like this for several months. Any thoughts?