Steve just sent me this story, which is severely sad.*
The timeline doesn't really make sense, though. The kiss happened over the weekend, she was given an adrenaline shot "almost immediately," and she died on Wednesday? It looks like something went wrong with the medical treatment. In other words, this isn't like the second opening sequence in X-Men. Acute allergic reactions, I've always been told, are easily treatable if addressed in time.
*I've been checking CNN.com myself throughout the morning, but didn't catch this on my own. The fact that the lead story is "PEAPLE ARE SHOPPING FOR GIFTS ON TEH INTERNRTON!!!!111111" has forced me to leave the page in disgust before seeing any below-the-fold stories.