The Tiniest 19 year old I've Seen on Screen?
Tatiana Maslany's year of birth according to IMDB.com is 1985. That meant she was perhaps 17 or 18 when filming Ginger Snaps 2. If so she's the tiniest teenager I've ever seen. I thought Ghost was perhaps 12 or 13.
That aside, her performance as Ghost was an eye opener. Ghost was insane but no one really knew until the end. Up to that point she seemed eccentric and perhaps in need of Ritalin.
I wish they'd do a Ginger Snaps 4: Brigid in the Cellar?