FYI, when I get to the point of hands shaking from low blood sugar, it can take me almost 20 min to come back to the land of the normal where I can put together coherent enough thoughts to let people know what's going on. She may not have been able to tell you what was wrong and she may not even be aware she asked you about the coffee. I've been told I have mostly normal conversations but I don't have any memory of them. Thankfully this has only happened twice ever but I can also understand your discomfort. If it was a medical emergency, then no rudeness on either side. If there was none, it's a little strange on her part and she should have at least asked to share, but you were not rude for moving.