You definitely seem like you're trying to manufacture a theory, but nothing you've written "better fits all the facts."
At best, I think you're operating under a set of faulty assumptions that's causing you to mistakenly reject most likely explanation.
Though the the surveillance and offers of transportation/"help" throughout the article appear to be about her, I think the real desire was to see who it was that she talked to and what they said.
Wouldn't that be like a new zealander visiting the LA and doing something the Bloods don't like, and so the bloods barge into his hotel room on the night before he returns to new zealand and says "hey is anybody else here"? Like, what's the intimidation? He's about to be beyond their reach, and they didn't even say anything explicitly.
If it's intimidation, it's both lame, ham handed, and ineffective.
An explanation that doesn't fit your opponent's behavior COULD still be correct, but maybe there's a better explanation - I don't know.
The Chinese leadership will kill as many civilians it needs because it is the only gang in town. Unchecked power at the hands of the few results in catastrophic consequences for the citizens. I'm sure they've learned their lesson from Cultural Revolution but unable to apply those lessons because those checks and balances, once again, is unavailable because Xi decided he wants to be like Putin.
My only immediate concern is for the people of China. If Russia is a model of what a nuclear armed dictator with an inferiority complex, there's no limit to what Xi can do to his country. He's already half way there, destroying the economy and the rivals to consolidate power. He doesn't care about the well being or the economy of the country. If he did, his actions would show otherwise.
> If it's intimidation, it's both lame, ham handed, and ineffective.
The intimidation is that they've shown interest in her and that they can get to her. It appears that she may have been a Chinese citizen (her account is translated), and Chinese people who annoy government officials in China may eventually be disappear into prison.
https://www.nytimes.com/2017/07/25/magazine/the-lonely-crusa...
That idea doesn't make any sense. They didn't search other rooms, and this person was a journalist that was covering a story that's more than likely embarrassing to one of their superiors.
It seems like they wanted to threaten and intimidate her in a deniable way. Their excuse was flimsy by design.
It seems more like they were looking for a specific person, instead of trying to intimidate directly. I'm aware of how intimidating this must have been, but they didn't say things like "show us the photos you took", or "don't discuss what you saw or else", or anything like that. She was already going to be leaving the town...
Or did they maybe want to catch her in the act of having sex with someone so they could blackmail her?
There's a strong implication that she suspected something else nefarious was being planned, which is why she kept turning down "too obvious" offers of exactly what she was in town for- but based on the behavior of the police who presumably did whatever they intended to do, it's not clear to me exactly what nefarious plan she wound up avoiding.
All in all, this is more confusing to me than anything else.