A visa-exempt entry (where you just show up without any visa) currently gives 45 days entry for US passport holders, which can then be extended for 30 days at immigration offices once in the country. This gives 75 days, which will cover the period you are staying.
you're so wrong about semantics. The Thai government has something called a visa on arrival which has completely different rules and qualifications and length of stay from visa exempt entry. They are totally different entry schemes that have nothing to do with each other.
Length of permitted stay is determined by your passport nationality, not where you are coming from, unless you have a 60 day tourist visa already granted by a Thai embassy/consulate.
It doesn't matter that she came from the USA or have legal residency there. Visas and extensions are based on passport nationality. She won't qualify for extensions since she entered on a Vietnam passport.
no idea why the OP interpreted your simple clarification request so negatively that he would call you a dick. Your question seems absolutely normally phrased to me and completely reasonable.
you misunderstood. You can't get two 30 days extensions back to back. In other words, you can't do 45+30+30 in one entry to Thailand because you can't get the second 30 day extension within 1 entry. Once you leave and come back, it starts all over with your initial entry plus one extension.There's no look back, beyond the usual caveat that immigration always has the right to look at your stay history in deciding whether to grant extensions.
Set up a company with minimum 2 million baht capital, hire 4 Thai employees to qualify for a work permit, and get your Non-B visa. Before you ask about lawyers and accountants, make sure you understand the basic requirements.
