Why did my girlfriend receive a METV instead of the DTV she applied for, and is it possible to change it later?

Jakarta, my gf applied for soft power with a 12 months (!) legit Thai cooking class course. No agency involved. They asked for further proof of financial documents, passport all pages, source and proof of income.

No regular (monthly) income but 600+k THB in the bank account in the last 4 months (they asked for 3). Also explained that money is earned through seasonal work (3 months work (earning 700+k THB, 9 months off) and that the plan is to use the DTV to educate further about Thai culture over the lifespan of the DTV.

Made a clear statement that there is no intent to work in Thailand and that the plan is to return to the next seasonal work after this course (and then back to Thailand to learn more and bring the thai culture back to the clients she works for).

We feel that everything was coherent and met all the requirements.

Still got METV for six months which does not even allow her to finish the 12 months course that was applied with. Also cannot extend or reapply from within the country after the 6 months so the course could not be completed either way with this visa.

I don't get it.

Why?

(I guess no one here can really answer...)

But much more curious:

Has anyone ever reached out to the embassy after and been able to get their METV visa changed to a DTV (due to actual valid reasons)?

Wondering if it makes sense, what's the best strategy, is it even worth it, etc.

Tried to find cases in the group here but didn't find anything.