Ouch.
Just read that thread. Is that the reason for her leaving, then? Unfortunate. She always did have an opinion on most things (which was great), and perhaps felt a need to post on a topic that, initially at least, was connected to her expertise as a surgeon. It unfortunately got a little bit neurological after a point - I wouldn't bit too upset about not knowing neuro stuff.
I don't know why, perhaps the way our education is set up, but there seems to be a curious somatic vs. neuro divide in medicine, and most folks, surgical and nonsurgical, quickly become less comfortable with neurological stuff after med school unless they're neurologists or neurosurgeons (or, apparently, anesthesiologists!). It's easy even for sharp folks to get confused when trying to put together neuroanatomy, which was what she was doing towards the end there. I wouldn't be too harsh on her with that. Hope she comes back, eh?