Thank you everyone for your input. I'm happy to hear they will contact me about further steps rather than physical email to my fiancé.
I spoke to a USCIS representative today and we're trying to escalate the case due to "humanitarian issues". I explained how China (a communist country) does arbitrary lockdowns/covid punishments and frankly how I'm worried about potential war over this whole US-Taiwan-China controversy. I just want to get her out of China as quickly as possible.