try posting this under the emergencies group, maybe someone else has experienced the same thing. If she is breathing and drinking, wait it out, sorry I am not much help here!
I have been reading this hoping you would come back and say it's alright now...still no luck? If it's bread, it could take a while, hopefully she will get thirsty again and get another drink...it does sound like she is choking a bit....keep us posted, sorry I don't have any more advice!