If she is a California-licensed professional, you can make a query and report to the State licensing agency if you have tangible reasons for sound suspicions that she is affirmatively misrepresenting her professional credentials.
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You should not do this directly, as she will just tell you to take a long walk on a short pier. Instead you enlist the aid of an investigator or you do the investigation yourself. If there is a legitimate reason to know then a lawyer can find this out for you, but that would cost a lot more, I think, than the economic value to you of knowing this. A suit could force discovery that would reveal the actual source of the degree so you could verify. For example, an unfair competition suit (an IP related suit) might allege she is using a false designation. Then in discovery you can compel her to reveal the information. I can't imaging the cost would be worth all that to you.
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Attorney McCall has already ably answered your question.
IF you're a direct competitor of the person and it's ultimately shown that her doctorate was fake and you can establish you have suffered direct financial arm as a result of her false advertising then you may, just may, have standing to file a false advertising lawsuit against her.
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