“My mother-in-law is visiting from Ghana. She is in the U.S. on a tourist visa. She has no medical insurance. We were told by my brother-in-law and her that she was in good health. She has been admitted to a local hospital with pneumonia and a salmonella infection.
Are we legally liable for her medical bills?”
That will depend on several factors, including the circumstances of her admission, what paperwork (if any) you signed, and the state in which you live. You should consult with an immigration attorney in your state.