Each state should have a registry of licensed family therapists and individual therapists as well.. by law they have to keep that up to date and available to the public so consumers can verify businesses are licensed to practice..
You don't need to go thorugh them to find out anyways... if she isn't in the registry then by law she's not entitled to practice FT and can't give FT advice to a client.. if she's caught doing that then she can lose her license