I once worked in a toxic environment. It was so bad that whenever I see my Supervisor's call, I panicked. I did exactly what you did, I resigned even without having any job then because my mental health was threatened.
Congratulations on the exam and proving to Dr Sharon that you are good at what you do.
Yes dear, that was the best shot I could give her as a reaction to her ill feelings and treatment. Anything that threatens our mental state should be avoided.