[sodacat]

I feel its two different movie pitches running into each other:

#1 is that there is not a profitable werewolf fan community as far as movies are concerned. There is a profitable monster fan community. These people will go to a movie to see monsters. Maybe fantastic monsters, maybe human monsters (slasher movie villains). With this in mind, if you're making a werewolf movie its going to need to be a monster movie.

#2 is that attractive people sell movies, and there are more attractive female actor hopefuls in hollywood than there are attractive women who can act. Think about how many movies you've seen that have an attractive woman in them who does nothing but look attractive. That's not by chance. She got paid. She signed a contract to look pretty on camera.

If she ends up turning into a monster then you're losing one of your selling points. Either she goes full monster and you lose your character who exists purely to be attractive, or she doesn't and you never get a monster.

An alternate possibility is that if you're going to invest the script space for this potential character to go through a monstrous transformation then they have to be a significant character, and you're going to run into pushback somewhere along the production chain from a guy who you need money from who is going to tell you that audiences respond better to a male character in that role.