Michelle,
One other thing you might try explaining very nicely to the provider is that whatever money she may make by coding incorrectly and getting payment for those codes is not worth what would happen if there was ever an audit. While she may feel that she is "coding correctly" or "deserves to get paid for her work" or "I have always coded it this way, so why are you questioning it?"....those are all refrains I have heard over the years from different providers I educated, and most of them saw the light once I dropped the word "audit" into the conversation. I dropped it in nicely, and with the utmost concern for the providers and their practices, of course...but was firm about the potential consequences. You are doing the right thing, and not risking your certification, or looking at an orange jumpsuit in your future. That is what matters.