In fact, she took longer than that. It's clear from the video that Yang asked her to clean the cueball right after he shot, because she walks into sight when the clock is at 39 seconds, and is already on her way to cleaning the cueball. When she moves away from the table after replacing the cueball there is literally 1 second left on the shot clock.
I have no problem with a rule that says that the time the referee uses to clean the cueball counts on the shot clock, but if you are going to allow a player to ask the referee to clean the cueball then it should not be possible to lose your turn at the table because the referee literally takes up the entire shot clock so that it is impossible for you to shoot in time.
And as long as she took to clean the cue ball, she apparently didn't feel she had even done a very good job because the first thing she did after that long delay to make the ruling, at the 1hr 56min 30sec mark, was to clean the ball again before handing it to Chang for his ball in hand. Maybe it was just a brain fart out of habit, but either way it kind of rubs salt in the wound lol.