Addicts are always addicted to something.
Be it their drug of choice, adrenaline, work, sex, violence, etc.
Her problem isn't yours, but you're enabling her by not giving her behavior consequences that would be negative to her.
If you love her, truly, go to narcanon (similar to alanon) and find out how to "detach with love"
If she's just a nice piece of ass, go find a new one.