Can a Thai national with dual nationality ignore a Non-O visa and enter Thailand on their Thai passport?

Okay here's how that actually works

Thaiz that hold dual nationality enter the country ALL THE TIME on their other country passport. They get stamped in free for the duration that country's passport gets, SO this lady most likely got stamped in FREE stamp for 30 days (she entered the country over a year ago)

THEN

Thais just go to the immigration office, show their thai i/d and they can get a year extension on a free stamp entry based on them being a thai national (they don't need a Non-O to get the year issued, it's done right off a free stamp entry)

NOW because they're here AS a national of another country AND they have a long term extension (that does require 90 day reporting) they have to file a 90 day report.

She was totally exploited if she was charged 6k baht for a late 90 day report😡👎 because the max fine you can get is 2000baht whether you're 2 weeks late or 2 years late.

The only way the fine could be more on a late 90 day report is if you're arrested (for something else) and they find out you didn't do your report, that's when it can be the 2000baht a day up to 5000baht fine.

Once she gets both US passports back in the mail, she takes them to the immigration office and they will move the extension stamp to the new passport (the current year she's on expires in April).

She can apply for a new yearly extension based on being a thai here on another nationality passport again no problem for another 1900baht when this one runs down. I know thaiz who have multiple year extensions on their foreign country passport, it's no issue at all.

Sadly what she can't do is swap passports at a land border. 😮 you cannot change nationalities by land. She would have to fly out of thailand on her US passport (getting stamped out) then fly back in presenting her thai passport when she enters to switch nationalities.

That is in a nutshell how this whole situation has and has to play out

As a Thai, I believe she can get a free year extension even though she entered on a foreign passport