The twist is good and took me by surprise. Just one thing, a twist needs to be prepared for without giving too much away. If your narrator says, while making up, that she seldom gets a chance to relax or have fun it implies that she has a tough job. If as you imply she goes undercover in dangerous situations, it anticipates the twist but holds some information back. Keep it up.

Wow! I was not expecting that twist at the end! This is a great story!! Great job!!