In my opinion she didn't have a choice. First, it was the right thing to do morally and ethically. Just firing the doctor was not enough, he'd go onto another hospital, especially with Daddy Warbucks backing. And this medical device would still be in play, potentially harming patients not to mention defrauding the government. Second, she rightly did not want to be part of the coverup, which would eventually come to light, and as we all know is sometimes punished worse than the crime itself. The board cannot vote to turn their back on medical corruption and collusion, that's ridiculous.