My EX wife wants to become a police officer?

My EX wife Stacy informed me of her plans to began a new career as a police officer. This scares me since she is the mother of our 5 year old daughter. I told her I'm worried about her getting hurt or even killed. She told me she will be fine and i am being sexist telling her she can't be a police officer I don't want to have to worry about her all the time i don't understand why she wants such a dangerous job. What should i do?