Paranormal Romance & Urban Fantasy discussion

Hey guys
Just wondering if anyone can help me with a book I read a few years back but can't remember the title!!!
It's a young adult one and I think the girl is a witch or has powers or something along those lines and she goes to a bording school and I remember this one part where the principal has a jar of lice.
Weird I know but if anyone has read this or knows about it can you please tell me what it's called?
Thank you

hmmm...i dont know but i am interested now

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Once a Witch by Carolyn MacCullough, i havent read this but i know shes witch and went to boarding school

do you remember the plot line?

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lol me too i wanna read it again but i have no idea what it's called
i don't think that's it though coz i think i read it around 2002ish?
i know there's a love interest as always lol but yeah i don't remember anymore :(