She is fortunate that, in so far as we know, she hasn't suffered a stomach or intestinal obstruction from the fur balls she's ingested. Such a problem is more common in cats and other animals, but does occur in humans as well.
Jmo: She only drinks colas, eats junk foods, and cat hair. After years of consuming small amounts of cat feces in cat hair, she may have brain parasites, also, of which there is no cure.
My unofficial diagnosis: She needs iron, calcium, and zinc and in addition, she would benefit from a healthier diet, including food sources of manganese found in spinach, kale, chard, raspberries, pineapple, strawberries, romaine lettuce, collard greens, garlic, summer squash, grapes, turnip greens, eggplant, and brown rice.