I asked our but was told they didn't have that information. Because I'm in a lawsuit I could I theory ask for her insurance companies name during discovery.
It's a good plan, thank you. I didn't think of Attorney General, but illegal stuff might fall under their jurisdiction. BBB is usually about mediation (I believe), but at this point we don't want to discuss anything with the clinic, a word out (Yelp and such) will be more valuable to other pet owners.
I've also seen somewhere a recommendation to contact the clinic's insurance company. As we don't know its name, I'm going to ask the state board for this info.