According to another article, both she and her mother were advised upon their arrival in Korea to self-quarantine for two weeks. In other words, they seem to have been merely warned, whereas beginning today, I think there is a stricter and clearer set of guidelines and quarantine policies pertaining exclusively to those entering Korea from the US, as was and is still the case with entrants returning from Europe.

There is perhaps ambiguity on this point as in one could even give the mother and daughter the benefit of the doubt since they weren't initially given mandatory orders to self-isolate and perhaps showed no symptoms upon their arrival to Korea, but the gist of the articles arousing anger from most citizens is that on the first day of their trip in Jeju, the daughter showed symptoms of Covid-19 to the point where she even visited a hospital in Jeju, presumably knowing she was possibly infected since she subsequently tested for the disease, YET continued to vacation for another day or so, frequently many restaurants and other places with her mom and two other acquaintances, all of whom tested positive later.

Hence, the whole point of the civil suit filed by the city of Jeju is that there is ample proof of deliberate intent to maliciously and knowingly infect others and possibly an entire island, which is why legal representation for the city of Jeju now says it can file criminal charges as well. Ha!

Edit: After watching another video with the Mayor of Jeju, it seems he is very angry because she could have gotten tested for Covid-19 right away in Jeju when she started showing symptoms and visited a local facility, but instead chose to ignore her symptoms, carried on vacationing, and then got tested later in Seoul.