China and visa problems

did she sign any documents? Usually you get filed with a criminal charge, overstaying the residency act I think its called. If she did she might get a letter in the mail from a prosecutor and she might get a fine. Not too sure about the future visas, but I guess it would be sent to her in the mail

If she has any chance of leaving the Chinese government out of this, she should leave the Chinese government out of this.
Germans have bigger issues than her overstaying her visa by a single day.
You can ask the border police in a causal manner, no details mentioned (do not mention the dates or names). Like asking for a friend over the phone, etc. They might just tell you to fuck off, or they might give you some good hints on what to expect when she asks for a visa next time.
If you cannot get any useful info out, and she omes back as a tourist next time, maybe pick another country than Germany for entering Schengen, so ask a Danish Schengen visa or Italian one.

If you marry her you can get a visa

>>1231440
Lmao I overstayed my 90 days visa free entry to Germany by 18 months and no one ever said anything to me when I left

Literally not an issue, just say your flight got canceled or some other bullshit. Minor overstays are common and gov't don't care unless it's some egregious 12 month delay or something.

Or just call them and say it was a april fools joke ;^)