Take a look back at the Olympic bid Pyongchang went up against Munich. On the one hand, there was Yuna Kim, acting basically as a PR tool. It was good enough for her to take photos with journalists and give a brief speech that was prepared beforehand. On the other hand, Kati Witt had a major role, where she had to lots of organizing and management to do, and underwent numerous relationship building process aside from acting as the face of Munich. One can easily see that her role was much larger than that of Yuna, regardless of final outcome of the bid.
I cannot imagine that Yuna Kim, who hasn't went to school since she was 14 years old or something, with very limited experience outside her sport, would be competent enough to take on serious roles such as Kati Witt did. I don't know what kind of educational background Kati has, but she has bundle of experience that could off-set any merits that a higher education diploma could bring.
So if Yuna Kim wants to become a Witt or a Kwan, I would recommend her to go to college. With her credentials, I'm sure the best schools in the world would be more than willing to let her in. She would have to work on her English though. She can give short interviews in English just fine, but I am dubious whether she can read newspapers or write a short essay.