Lets hope she doesn’t have any of the myriad of possible complications of a hospitalization or surgical/biopsy procedure: healthcare associated pneumonia, post-operative infection or pneumonia, aspiration of gastric contents, pulmonary thromboembolism, allergic reaction to anesthesia, stroke, heart attack, etc. At her age and with her overall health, even though she appears tough and determined, things could rapidly go bad.
Complications are for serfs like you and me; our overlords get the best health care in the world our money can buy.