Bear it for a few more days and see if you still think so?

If you still want to, call her. If you still feel so strongly, I suggest you go directly to Yanqing. Don’t say you are looking for her, just go there as if you have something to do, and then chat and eat with her. This way you can still Get to know her better, and if you think it's really a good fit, tell her the real situation before leaving.

We can only see her reaction after that.

Good luck. . .