Would be very interesting if a case could be brought before a court in any country to see if the evidence holds legal water. She mentioned "the preponderance of evidence", the much lower legal threshold for a civil case. If it really did come from a Chinese lab, for whatever reason, then it's undoubtedly gross negligence. China wouldn't even have to defend the case, the plaintiff would only need to satisfy the court, which is far easier without the "beyond a reasonable doubt" threshold.
Of course, any punitive damages would probably be pretty meaningless unless they were class actions and governments were willing to freeze Chinese international assets to pay the damages, something they could do if only they had the spine.
If true, it's no surprise China has tried to cover it up. How many people across the world have suffered or lost loved ones? How many of those have access to an adequate legal system? How many hundreds of billions have been spent by governments trying to combat covid? Just imagine if everyone sued China and the governments actually seized all their assets to pay the bills.
Of course, there's more chance of hell freezing over than that happening. Which, if it's true, is a real shame. If countries want to play with deadly pathogens, then they should pay the price in full when they fuck up. IMHO