What do you do when you end up seated next to someone who is obviously sick?

When I got to my seat last week, the lady who was sitting beside me had taken both our blankets and pillows and was "cocooned" in them. She was sniffling quite loudly so I didn't want the blanket and pillow back. Throughout the whole flight she was wheezing, coughing, sneezing and hacking. Of course, she ordered alcoholic drinks throughout the flight as if this would help her cold/flu. I just tried to stay out of her coughing/sneezing range for the whole flight. What else could I have done?