However, a disturbing pattern began Sunday at the aid station at 10 kilometers (6.2 miles). A mile after she drank the fluid, it came back up with an acrid burp. It happened, at intervals, five more times and she didn't take her drink at the eighth and final opportunity.
And because Goucher couldn't get the fluid to stay down, she became dehydrated. In the 19th mile, she began to fall behind the race leaders -oregonlive.com
MY COMMENT: According to the article, Goucher was using "diluted Powerade mixed with electrolyte replacement gel". Strange. I wonder if she even tried taking in plain water. She had similar problems in New York last November.