However, it is likely you are looking for one of the following tracks with similar themes or titles:
It features heavy percussion and Demi's signature "power belt," similar to her work on the Holy Fvck album but with a more polished pop production. If you'd like, I can: Help you find the lyrics to "Bad Chick" or "Bad Girl." Demi Lovato Bad Chick mp3
This is a heavily circulated unreleased track from earlier in Demi's career (often associated with the Demi or Confident eras). It is a pop-rock anthem about female empowerment and confidence. However, it is likely you are looking for