It happened because of a mistake in the visa. The tourist was taken for questioning that lasted almost a day. After that, the Russian woman was fined and sent to a temporary detention center, where she was supposed to stay for two weeks.
But when the deadline expired, no one released the girl, and she spent almost another week and a half there.
As a result, almost a month later, the traveler was expelled from the country and banned from returning to China for another five years.