That is a pretty severe reaction to something and you should definitely get her checked out straight away. Ask your GP for a referral to an allergy specialist. Those symptoms are what DD got when I tried her on peanut butter and her allergy is so severe that I have to carry an epi-pen everywhere. It is MUCH better if you find out now as reactions can get worse the next few times.
I was happy I found out, it's a relief to know that I have the medication handy to help her now if necessary.