Weird idea I had for Ginger Snaps 3.
It would be called "Ginger Snaps 3: Together Forever", and would of course have both Emily Perkins and Katharine Isabelle. I figured it would be a good idea for Brigitte to face a much more adult problem than what she faced in the first one (puberty) and even the second (addiction), given that Ms. Perkins is now in her 30s.
My thought for continuing the plot would be that, after a year or so of feeding people to Brigitte, Ghost is found out by another werewolf named Nick, who rescues Brigitte and gives her a new cure that allows werewolves to maintain human form most of the time.
Many years pass, and Brigitte (now an adult) is married to Nick, and the two of them are living together in a small town in the Cascades, where their lycanthropy will not draw too much attention. Nick is beginning to grow increasingly violent and possessive of Brigitte, however, and starts seriously injuring her when he suspects her of being unfaithful. He justifies his actions by saying that he rescued her to begin with, and she'd still be in the basement if it weren't for him.
Brigitte gets fed up, and leaves to spend time alone and arrange a divorce. But a woman that looks mysteriously like Ginger seduces Nick, and convinces him to pursue her. Brigitte suddenly finds herself being stalked by her werewolf ex-husband and the phantom of her sister, who may not have been as dead as she suspected, or may have been revived.
Nick would be defeated by Brigitte at about the third act, leaving Brigitte to finally confront Ginger and the promise they made that they would be 'together, forever', a quasi-magical force which had kept Ginger from passing into the afterlife and torments Brigitte mercilessly. Brigitte finally makes peace with Ginger, allowing her to die for real and curing Brigitte of her lycanthropy, allowing her to finally live a normal life.
It's a bit tacky, but I believe Brigitte deserves a happy ending.