Never got paid

Okay so my 16 year old got her first real job at a local cafe in Fremont. The issue is she hasn’t gotten paid yet and she started working in October. There have been quite a few red flags I’ve ignored but kept register in the back of my mind. Now I’m trying to coach her into applying to a different Cafe and not working there anymore. She says I’m over reacting and she feels a sense of loyalty to this Cafe owner. I don’t think this is normal but I’ve never worked as a waitress or a small business owner. He gave her cash a few times during training but nothing more. My other question is do I step in and email or call the owner to clear up some conflicting information I feel he is giving her. She is a minor still but I want her to have ownership of her career, so I’m torn. I don’t want to reveal the cafe and hurt their business. I just need to know I’m either doing too much or I’m not crazy, this is in fact weird.