Boss is a complete bully! Your opinion?

I think you should continue to do your job like you always do. There will usually be someone who makes you nervous, but you just have to nod and go on with your duty. Don't show them any fear or let them intimidate you. As for her, well, she might get caught eventually for not knowing about her job. It's her loss for not asking for help with her duties because that will surely help her. You can continue finding a job if you want, but don't really let her bother you with her insecurities. I know someone who makes me a bit nervous, but I have had others say the same thing, so I just know that I am not alone like you are with your coworkers.