The Dept of Consular affairs is the same organization as the one mentioned in step 3. On Chaengwattana Rd, next to the government complex. Where all offical translations go to get a final stamp from the government (as well as a bunch of other things).
If she has recently applied for a new mou work permit why are you trying to get her a tourist extension? Just let the process happen. I think because of the backlog due to the virus they have extended processing times. Normally if she has evidence of application that will be fine for immigration purposes until the stamps are put in her passport.
Odds are she is legal at the moment, but the government in their wisdom renews most work permits for migrant labourers at the same time every year - March. If she is legal she’ll have a passport with an Non immigrant LA visa stamped into it, as well as a ID card sized work permit. Both will be valid through to March.
Hire an agent used by the Burmese to do their visas. Now is the sign up time. They get LA visas under the migrant labour programme. Most of the info will be in thai so just get the agent via the Burmese community grapevine