I have to go with diet related issues as well. Not sure what vitamins / minerals she is trying to get though. If you haven't taken your bird in for a wellness exam, might not be a bad idea to take her in to see the doctor. He can probably give you a better picture. Ask him about diet supplementation. My bird is on raw fruit/veggie and some nuts and pellets. My vet okayed me to use the following supplements in moderation: bee pollen, spirulina powder, calcium powder, red palm oil, probiotic powder, vitamin drops, cinnamon powder, something else which I am forgetting right now. Since your bird is on a mainly Harrisons pellet diet, it might not be necessary, but you have to wonder if that diet is truly complete since she is eating her stool.