What documents are required for re-entry into Thailand on an OA visa?

𝗜 𝘄𝗮𝘀 𝘀𝘂𝗿𝗽𝗿𝗶𝘀𝗲𝗱 𝘁𝗵𝗮𝘁 𝘁𝗵𝗲𝘆 𝗻𝗲𝗲𝗱𝗲𝗱 𝗮𝗻𝘆𝘁𝗵𝗶𝗻𝗴 𝗴𝗶𝘃𝗲𝗻 𝘁𝗵𝗲 𝘀𝘁𝗮𝗺𝗽 𝗶𝗻 𝗵𝗲𝗿 𝗽𝗮𝘀𝘀𝗽𝗼𝗿𝘁 𝗮𝗻𝗱 𝘁𝗵𝗲 𝗳𝗮𝗰𝘁 𝘁𝗵𝗮𝘁 𝘄𝗲 𝗱𝗶𝗱 𝘁𝗵𝗲 𝗳𝗶𝗿𝘀𝘁 𝟵𝟬-𝗱𝗮𝘆 𝗿𝗲𝗽𝗼𝗿𝘁 𝘀𝗵𝗼𝗿𝘁𝗹𝘆 𝗯𝗲𝗳𝗼𝗿𝗲 𝘀𝗵𝗲 𝘄𝗲𝗻𝘁 𝘁𝗼 𝗝𝗮𝗽𝗮𝗻,

You shouldn't have been

The stamp in her passport is an ENTRY stamp and it cancels when she stamped out of the country.

It's the PDF file print out of the eVisa that actually lets her get IN to the country and it should be noted on that PDF when her mandatory year insurance expires (meaning she wouldn't have needed that insurance paper which is always good to have anyway)

PRINT OUT the PDF files of your eVisas people <- that actually IS your visa to get in to thailand 🙂

I think we have taken this post as far as we can. ...

Best of luck with your travels in the future

We are done . .. ...

“Why does this happen?

Because with an O-A visa, every time you enter the country Immigration carries out a new check of your insurance and documents. The stamp in your passport isn’t enough; Immigration has to verify that you still meet the visa requirements on the day you enter Thailand.”

So immigration are doing their job!!!!

Did she have the third document ?

This could have been the TDAC it’s an electronic arrival card you must fill out on line with three days up to arrival, you get a confirmation email with a QR code, this automatically show on their systems if she hadn’t done it they may have been asking for this.

That is precisely how a Non O-A visa operates. You are admitted for one year at a time as long as the visa itself remains valid, or until your health-insurance policy expires — whichever occurs first. The 90-day report is entirely unrelated to entry regulations; it is simply an administrative reporting obligation triggered once you have physically remained in Thailand for 90 consecutive days.

For entry, the required documents are straightforward: your passport, your Non O-A visa, valid health-insurance coverage, and a completed TDAC electronic arrival card.

I don't know what the third document requested by Thai Immigration was when your spouse arrived in Thailand by Air.

Usually it's proof of your CURRENT health insurance policy which is a requirement for the OA visa for retirement and shows the ending date of that policy.

Reentry permit?