She was a spy--look at how intense their reaction was.
Unfortunately, they tend to grab innocents to exchange for captured spies. However, they're going to go for big fish, not little ones. As an average joe I'm not concerned about being held for a spy swap, but if I were a highly placed executive there's no way I would set foot in China.
Hence intense reaction. The 2 Canadian Michaels on the other hand, were text book spys with NGO covers. Western propaganda likes insinuate PRC would capture innocent westerners when state security have massive state survillance capability that completely dismantled CIA networks a few years prior. Like literally friend of Michael hinted he was in "intelligence" and CSIS (Canadian CIA) publically celebrated on twitter upon their return. The Michaels weren't executives. The TLDR, while in PRC, don't traffic drugs, don't be a spy/do anti state activities, don't get involved in expensive legal proceedings - the latter is what actually get (white) westerners in trouble via exit bans.