Do an online search. It has been a while since I've read about it but from what I remember, now that she has had a reaction it can get worse with each new application. Some of the symptoms I remember are like you described but they can also get blisters, lose the hair where it's applied, have seizures and even death. Call your vet. Also, report it to the company and the Enviromental Protection Agency. So many people don't and that is why you don't hear much about the bad reactions.
I did a quick search - here is one of a few I found....
http://www.dogsadversereactions.com/...urvivors3.html