Think it’s reasonable to assess people want to keep their money where they choose, not trusting Thai banks is not the issue, it’s that they pay no interest for it! That’s why I’ve kept a non OA as long as I can. Compared, I’ve made a profit.
But in fairness Thailand also seems to make it more difficult to get your money back out if it’s needed elsewhere or urgently.
I can only speak to the US. Deposited funds in federally insured banks are safe up to $100k per person. FDIC has been around a long time now
being a green card holder or more in association to becoming recognized doe not require a residency, only an address to send paperwork and in addition your problem of getting her there for any reason using any method will not be any faster.
None of my business but it seems not already having done some of these things (as it’s to her and your benefit) is a little odd because why wouldn’t you? You can up your social security benefit (assuming you have) and facilitate more opportunity. Again, well aware it’s none of my business. 👌