My Opinion
I would like to state, this is clearly my OPINION. I am in no way an expert,or a judge;HOWEVER there are a few things here that are quite clear.
I thought Jenn B. got hosed by the Head Referee myself. The match ref clearly made a few mistakes, he had the power to overturn the ruling. During the discussion after rack 8, I believe you can hear Jenn B. stating that she is "not Taiwainese." This meant to me that she missed her chance to call foul after the illegal break on rack 8. By rules indeed perhaps too much time had passed'however if there is a language barrier issue that would have caused this, I think the Head ref should take that into consideration.
(Look at it from this perspective: If you were Taiwanese playing a tournament in USA, travelling half-way across the world in order to play, would you stand up and call FOUL if you were not sure because your chair was 25 feet from the table??) If there was no foul, then you would have committed a foul by interrupting play.)
The head ref should have cancelled/nullified rack 8, with an apology to Tsai Pei Tseng.
FWIW, the match ref missed the 3 ball kitchen call on rack 7 which was Jenn B.'s break.