Hello and thank you for your post. The best way to become certified is to go on the Zumba.com website and pull down the link, ‘become an instructor’.
There are trainings all over the world and you can find one in the CA area pretty quickly. What a great gift to give your instructor. I am curious, how can she be teaching ZUMBA without being certified?
Keep dancing ZUMBA and it will prolong your life. Hugs, Shellie