I didn't write she could not work as a Music Therapist... I wrote that it is hard to find a job as a foreigner. And that she needs to find a job where the employer handle documentation for work permit and support in the Non imm. B visa application.
Btw, I am fully aware of the list of restricted/prohibited jobs and the Alien employment act.
It is hard for foreigners to find jobs in Thailand since a lot of proffessions are reserved for Thai citizens... it is not impossible, but hard.
You need to find a job where the employer handle the documentation needed to get a work permit and support your application for a Non immigrant B visa (you need a job to apply for that).
Another option is to find a job outside Thailand that allows you to work remotely from Thailand (or start your own business working online with non-Thai clients). Then you can apply for a DTV (Destination Thailand Visa).
I remember when it was collected in the airport... However it is now said to be 300 thb and there is some that claim that the delay of the ETA-implementation is due to get this included in the system. I guess we will just have to wait and see...
You write "In Australia I would probably keep working doing what I do in NZ"... Does that mean working remotely? If so, you could probably do that in Thailand too. Take a look at DTV (Destination Thailand Visa). That could be an option for you.