Daughter was stung yesterday on forehead by a wasp or hornet and now 1 eye is swollen shut and the other is half swollen shut. We been using ice a lot and I tried getting her to take benadryl but she won't take them. Should I take her to emergency room?

In one word - Yes. Minimally CALL the ER and ask.

She was stung yesterday and today is getting a reaction?

Yes, take her in.