Insurnace fraud???

I was court mandated to provide health insurance for my child since his mom started asking for welfare assistance. Before that my child was covered through medicaid with his mother. She was pretty upset that our child’s insurance was going to change because that meant his doctor and specialized care were also going through change considering she waited a long time for that specialized care to get approved. I told her the only way to bypass this was for her to stop collecting welfare but she refused so I kept the private insurance. Long story short, our son needed another specialist and when we went to the doctor, I provided my insurance card but she cut me off and gave the receptionist her medicaid card instead and was adamant about the provider billing her insurance instead because the authorization was done through hers. She claimed that if the provider ran my insurance then he was not going to be seen even though I have my insurance is an EPO.

Can doctors do that??? Why would they run any authorizations through hers if the law states private gets billed first?

Should I report her? She claims she didn’t make the choice and the pcp ran hers because it has been our child’s insurance since birth and so that his specialized service won’t be interrupted. Then why pay for private if doctors won’t bill it?? I don’t want to report her if it means our child will have to start from scratch but I also want to make sure no one is committing fraud.