Where in Seoul do you get a visa if you are a US citizen with ARC?

My daughter is in Seoul on a Korean government-approved exchange program. She would like to visit China for a few days after her assignment ends. She was told she had to make an itinerary, and get all travel arrangements first. She bought her plane and train tickets, and arranged lodging, as per the various websites that said you had to have all that before you can apply. Then we saw this site where it says that no individual type are possible! But the info on that page is from 2007. Are US individuals able to visit PRC from South Korea? If so, where does she go to apply?