Since 2014, there was a ban on migration of domestic workers from Myanmar to Thailand, so they could only migrate illegally and get registration (pink card) once here in Thailand. Myanmar has now announced to lift the ban. Your domestic worker has probably a pink card that is going to expire on March 2020, as everyone else. The two options are either to get a new pink card in your name or better go back to Myanmar and come back through MoU, that now should be possible. You can go to an agency. You can get some information at Homenet NGO, she can also check App Golden Dreams or facebook page MissMigration . I also sent you a PM.