Why did they say that anne boylen was a witch?

they said that Anne Boleyn was a witch because the people thought that she had cast a spell on the king to make him fall in love with her marry her and divorce his wife Queen Cathrine. divorce in those time was not allowed. some people also believe that she used spell to get herself pregnant with a boy, and instead of giving birth to a boy she first gave birth to a heavily deformed child and then Elizabeth, one of the most memorable queens in English history. it was also believed that she had six fingers on her left hand.