they can't deny the visa if your paperwork is ok. Especially if you have a Thai partner. No chance to deny. And an immigration officer would not risk to explain with he deny against the law an extension if all papers are ok.
All the people who pay make it harder for the other ones.
The problem is that this is only for kids until 12 years old after this age many airlines don't offer or you have to pay extra for the service, I know Emirates offered it for free bc my kids were flying 10 times with them as teenagers
what you want to bet it's incorrect, it when the amount drops under the 400.000 or 800.000 you are not loosing your extension or you not become on overstay.
why you are publish lies? If your amount droppes under the required amount it has nothing to do with the extension. You can do with your money whatever you want. The only problem is the next extension. And she can of course go as a dependent on her husband's non O extension. Easy to do just get a new non O visa and then apply for extension.