Ginger Snaps 2: Unleashed
Brigette (Emily Perkins), infected with the warewolf curse, is being hunted by another werewolf (Jake Mackinnon). She passes out in the cold, and wakes up in a mental institution. The werewolf follows her and kills a number of the patients before she and Ghost (Tatiana Maslany) escape into Ghost's house. When the werewolf follows them there, Dr. Brookner (Patricia Idlette) kills it, but is then killed by Ghost, who by the end has a very angry, fully transformed Brigette locked in the cellar as a "pet."
Thanks, Rob T!
(Links open in new window)
Read more about this film at The Internet Movie Database.