Re: Zug: where to go for treatment on public holiday?
If she was stung on the head above the nose, in a non fleshy area, then the sting will make the body create fluids, and her face will swell up, even closing the eye lid. As she has not collapsed, there is no real danger now, as long as her throat remains free to breathe.
You can only wait now, it might take 3 to 5 days for the swelling to reduce, but you can buy some cream, and maybe anti histamine tablets to reduce the itching. Go to any pharmacy and there will be information on the door, telling you which pharmacy is open today. All of mainland Europe has a holiday today.