@Richard *******

yes, she should be able to.

@Richard *******

when you get to Thailand if she can produce a copy of the house book she was listed in that will be a big help. At the extreme she might need a DNA test, and be able to compare that test with a Thai relative's DNA test to prove birthright. It helps if she knows which province she was born in, and can get a copy of her birth certificate. Even though her Thai passport is expired, she will still be let in as a Thai, and go through the process of getting her new Thai ID card. It could be simple, based on her expired passport, or involve DNA tests as the extreme requirement. Direct Thai relative's can help greatly.

@Richard *******

contact the Thai consulate in LA. They deal with this enough to know what she needs to do. Does she still have her expired Thai ID, and passport?

I have a strong feeling the OP is not talking about a DTV. I suspect he is talking about a regular visa exempt entry, or an actual tourist visa.

@Alex ******

believe what you want, and the statement you pay taxes has no relevance. I pay taxes too. In fact my wife is a licenced accountant.

@Alex ******

I do live here, and Brandon is correct.

Have you been paying your income taxes on the money you earn doing that, as they most likely will ask to see your tax returns?

Fresh passport makes no difference, as they have your finger prints, and facial recognition for past reference triggering their computer system. Thailand is actually very modern now computer wise. A new passport makes no difference.

@Michael *******

that is true, but has no reference to the OPs question.

@Michael *******

with the only two options the OP listed, the type O based on Thai wife has a lot to do with it.