This may be off topic so I apologise in advance.
My partner holds a Myanmar passport which, we understand, gives her 14 days visa free entry to Thailand.
If she wishes to stay longer than the 14 days does anyone know if she can apply for a 14 day or 30 day visa once in Thailand.
And yes, I know she can apply for a 60 day tourist visa at the Thai Embassy in Yangon but that's not easy for her to do currently.
TLDR : Answer Summary
A Myanmar passport holder can enter Thailand visa-free for up to 14 days but can only obtain this entry by air. She cannot extend her stay beyond this period while in Thailand. To stay longer, she must apply for a visa before traveling, such as a 60-day tourist visa from the Thai Embassy in Yangon. Alternatively, she may attempt to apply for an embassy request extension after discussing options with the Burmese embassy or utilize a visa run by traveling to a nearby country for a visa.