Aliases
If you have watched any gangster or crime movies, then you probably know that organized crime is a dangerous world to be involved in. If you are undercover and have turned some people over to the police, you need to watch your back for probably the rest of your life, unfortunately.
Criminals just do not forget, so it would make sense that this person would have to change her name multiple times to hide from dangerous characters. Who knows when someone might find you and try to take their revenge on you or your family? Fighting crime is never an easy thing to do.