Couple of questions...
2. Why aren't such statements grounds for an immediate review (and hopefully revocation) of her professional license status?
Having done a couple of these cases, the provider still has a First Amendment right of free speech. You can think or say whatever you want, but as long as it does not impact your professional obligations to patients, unpleasant or biased speech is generally not grounds for licensure sanctions. However, many states have a 'moral turpitude' clause that can serve as a catch-all grounds for the state going after your license based upon certain types of behavior.
In this case, the provider was stupid enough to provide written evidence that her beliefs will, or have, impacted her professional judgement and obligation to treat patients without bias. So if I were her, I would not be surprised to get a letter from the state medical board that issues her license, with notice of a complaint or licensure hearing.
Speaking as the risk manager, I would also be firing her from my employment as well. But you have broader grounds to discharge from employment than going after a professional license.