If you do an Ed visa and enroll in a class, it's advisable to go as the Royal Thai Police are still doing raids on schools, there has been over 1000 people arrested in the past 12 months to date.
Sorry one more thing. Her contract finished April, but she was overseas, stamped in on her extension, she is not on an overstay I assume till her work permit is cancelled? Which will be today, would that be right, I'm not sure considering I don't work here
You 100% need written consent from the parents to accompany minors out of the country, and has to be a legal document, a notorised permission letter, I'm not sure of the exact process here in bangkok but this 100% required