Different immigration offices have different rules. Recommend you comment at which office you will apply, then maybe someone that uses that office can advise you.
Very difficult to get a visa and if you are successful, it will literally take months. Easier to fly her to Mexico and pay a coyote to sneak her across! Of course I'm not suggesting that you do this but it would be easier.
If it's not too inconvenient (e.g. a long drive for you) go to BKK bank and ask them in person. That way you'll know for sure what the bank will accept.
thanks but I have no need for an agent. I keep 800K in a bank account. I was just making a suggestion for the person who made the initial inquiry about 65K a month, if he didn't have the 800K.
If you don't have the 800K Baht in the bank there is another option. That being to pay an agent to front you the funds. In my experience most, if not all agents offer this service. However, it'll cost you in the neighborhood of 30K Baht for your first 15 months in TL.
There is a tax treaty between the US and Thailand. I've looked it over & if you are paying tax on your pension(s) in the US, then it looks like you will not need to pay taxes on the money you transfer here. However, you may be required to file a Thai tax return and show proof that your money has already been taxed. Keep in mind that I am not any sort of tax expert so as Peter Weedall already said, nobody really knows what's going on yet.