Meet cotton candy (to get answer questions below)

Name: cotton candy
Breed: unicorn
Gender: female
Age: pony
Personality: shy, witch like, mute, powerful, evil
Likes: poison, witchcraft, gothic stuff and magic
Hates: twilight
Interest: zecora

Questions:

-how you plan to use her?
- what is witch craft?
- how can witch craft be used in mlp?