Anonymous participant I don't recall the latest but London used to be fine with minimal to zero seasoning of funds. Let her application stand on its own without your name injected. Use group search tool to see what others have said about London recently.
Too much detail methinks, especially about she'll be working for you etc, she's not allowed to work . I'd not include anything about working for you in the least.
The cooking school should prove to you they have a track record of successful DTV approvals, they'll know what paperwork to provide if so.
Anonymous participant scan it and see. I scanned mine and it's just a string of text and numbers. I'd be curious to present the approved printout to an IO upon entry just to see what happens, possibly they might stamp you in. You could plead ignorance as to the second status. I mean who would really need to go back to the e-visa website after getting the approval on site and by email. Not sure what you mean about the QR code, if rejected there is no visa and QR code issued.
Personally I'd consider communicating directly with the MFA with screenshots etc after this apparent boondoggle. How are you supposed to know the real application status when it changes? How did it take 3 days for a possible approval error to be spotted? What's even more disturbing is no apology or information supplied as to why it changed. I think the foreign affairs ministry office would be very interested in this (I've) never before seen chain of events.