Thank you for explaining it clearly.
My new idea: Since she already has her B1/B2 visa, she can come visit for a month or so (up to 6 months), maybe in October/November. She's already stayed with me for a few months back in 2019 before the pandemic.
So since we've established she will not be receiving physical mail about the interview date/etc., does she need to keep her apartment or can she just "move back in with her parents" (in her hometown) while she visits here? 6 months is a long time, I'm optimistic that she will be granted her K1 visa in the next 4-6 months. She could technically visit me for the next 6 months while we wait for her interview, then she can just fly into Guangzhou for her interview....right?
How long after the interview does it take to get her K1 visa?
Also she has two cats in China, not sure what's the best way to get them here safely