Condolences to their families. That said, this is very suspicious.
Especially since, for such an outstanding if not prominent citizen of both China and the U.S., there has been abundant news coverage of her death, but absolutely no details.
Such a death in the U.S. would have good coverage which suggests she was on private property or not even in the U.S. If not in the U.S. there may be no autopsy.
Both she and her family have major ties to China's business interests, which includes primarily the Chinese government. She most likely would have had a competent chauffeur and may well have been in an armored vehicle.
Lots of questions.