When I was working in Bangkok my colleague had an issue with his Non B. It was about to expire (as in less than a week) and no one was aware. They were under the false assumption it was a one year visa. No one understood it had to be extended before the 90 day mark.
The company hired an agency as they were clueless. The agency gathered paperwork and headed to CW to file for the extension. There were errors and other paperwork was needed from the company. They gave an extension for the company to gather the paperwork required. I believe it was for 14 days.
If the appointment isn’t for her she will have to wait outside the embassy. Hell, when my wife was getting her fiancé visa they wouldn’t let me in with her and I’m the American.
I asked this before and (like many things) depends on your IO. I am in Pattaya. I went to the Jomtien office before I left and asked this question. I told them I am coming right back to that same condo. They said “you must do every time.”
I have. Update your mailing address to your Thai address and when you search for something it will tell you it’s only showing items that they will ship here.