Sally

Sally is one of Mitzi's friends (or followers) along with Darma.She first appeared on Episode 8 of season 4. She is the one with long, purple hair. She is also seen in her dark winx form.

It is interesting to note that there is a Witch student from Cloud Tower that looks called Shilly that looks like Sally just with different coloring. If Sally is really a witch or that she has a counterpart, a twin witch, shares the same style as a Witch from Magix, or that it was just a character error has remained to be seen.

It could be that the Witch is from earth as it has been stated that fairies have not been seen on earth since their devastation from the Wizards of the Black Circle but that does not mean that Witches were effected. Or like Mirta or Miss Faragonda she may be a hybrid Witch Fairy but leans more to devastation like a witch....

This remains to be inspected more.