Hello there Gallstones are not because of covid. Its would be there for quite some time. Its just that she got infection of gallbladder in month of January. Gallstones are due to Factors that may increase your risk of gallstones include: Being female Being age 40 or older Being a Native American Being a Hispanic of Mexican origin Being overweight or obese Being sedentary Being pregnant Eating a high-fat diet Eating a high-cholesterol diet Eating a low-fiber diet Having a family history of gallstones Having diabetes Having certain blood disorders, such as sickle cell anemia or leukemia Losing weight very quickly Taking medications that contain estrogen, such as oral contraceptives or hormone therapy drugs Having liver disease