According to the search results, Suyin, played by Li Bingbing, died after the events of The Meg and her death is confirmed in Meg 2: The Trench. The reason for her death is not provided in the movie, and it is unclear why her character was killed off-screen instead of finding another way to explain her absence. Her absence is explained in the movie, but the details of her death and what happened in the years between films are not provided.