She has been here on since 2009. The stamp looks like an extension of stay. If she is on an extension of stay this year and using the income method doesn't she need to show monthly income of 65,000 baht/month for the entire year? If using the banked money method wouldn't she have to show the proper balance for the entire year?
The OP is asking about extensions. A 1 year extension can be based on retirement or marriage. If your original visa was an O-A then you need insurance for an extension based on retirement but not for an extension based on marriage (or so the reports say).
You are correct that the visa, obtained outside of Thailand, is solely for those over 50 years old and they require insurance.
A visa is not an extension. It is the extension that the OP is asking about.
If your original visa was an O-A you can get an extension of stay based on marriage without the need for insurance. Of course, you have to be married to a Thai to do this.
I am here on an extension based on an O-A visa. I will need to show my insurance this November when I apply again. I have Pacific Cross insurance with a large deductible. I like the terms of the insurance and it is slightly cheaper than my US insurance was. Getting Thai insurance can make sense and not be too expensive. I understand that it is an additional expense for many people from other countries. You might want to do this for one year only until borders open to allow you do get a non-O at a later time.
I am using the banked 800,000 method. I believe the income method requires a minimum of 65,000 baht/month deposited to your Thai bank account and that the money must come from outside Thailand. That is it needs to be labeled as an FFT (Foreign Funds Transfer) on your bank statements.
Correct but if you use non-Thai insurance you need to get your insurance company to sign the insurance certificate on thr TGIA website. That used to be hard to do but maybe that has changed.