Also concerning her being my boss. .. it turns out that my girlfriend is really good friends with our boss (the Muslim lady I talked about) and she advised her that Ava is not ready to manage another engineer who is almost 10 years her senior. So I was moved out of engineering and am a Senior Project Manager now. They hired Ava 2 junior engineers to do with as she pleases but I was given project management responsibilities over her projects.
Ava should have a gun to protect herself from others and herself. Does she own a gun.? I believe it is quite easy to buy a gun and 'carry & conceal' in some parts of USA.
I think you should also be grateful/thankful to Ava for getting you a nice Churchy gf, who in turn got you a nice promotion over Ava. God is good.
....... So, you should be nice or cordial to her.(God/Jesus is watching ...).
Bear in mind that Ava is a talented, good, effective and productive manager+engineer. Maybe, even better than you, wrt being a manager. Her main drawback is her sinful/hedonist and lazy/unkempt private lifestyle, which is actually none of anybody else's business.
AFAIK, management positions require more people/social skills, rather than engineering or machining or scientific skills. Handling people, eg subordinates or superiors or customers or liaisons or sub-cons or suppliers or shippers, is no joke or not easy because every person's character and surrounding are different.
For men/boys, such management and social/people skills are usually inherited or born-with, eg extroverts, sociable, optimists, confidence, pleasant looks, etc.
....... Eve/women/girls are natural-born managers because they were created by God to be home-managers. Adam/men/boys were created by God to earn a living for the home/family, eg by farming, rearing, hunting, fishing, etc = natural-born farmers/fishermen/engineers/technicians/scientists/surgeons/etc.