Mostly agree, but;

The reality is that if China stops supplying the world with stuff, we’re fucked

The entire world relies on China’s cheap and available “stuff”, and it encompasses everything

I think is more their engineering expertise than cheap manufacturing. Cheap manufacturing can be easily moved to other countries as is already happening in India and Vietnam among others. However China has big expertise in high tech/large scale manufacturing in many areas like electronics, batteries, EV’s,… that doesn’t move easily.

However for those engineering domains China also strongly relies on other countries. In our world you can’t do everything alone.

The have enormous military power

They haven’t fought a war in 4 decades though.

Has she lived outside the country before? Do you want to go somewhere else with her? If she wants to stay close to family why not try Canada? It’s close by, similar climate and time zone and culturally not that different from the north east.