Hi @NataliaB, I'm sorry I don't have any experience but I'll tag a couple of ppl that might know. I'm not sure if they are awake now since they're in America Isn't there an emergency vet you can call and ask? How's her breathing?
I know many ppl here give Benadryl for allergic reactions but I don't know the dosage, we don't have Benadryl where I live.
Please keep us posted.