How much we know about Serena? Because I don't remember any clue that mention any trait of her (apart from she left her home and fuck with wolfs). Mayble the werewolves' main quest hasn't started and we've only seen a prelude.
Your right the only thing of hers we ever had was the pendant and that's not a physical description nor a hint to how she looks......and if it's a prelude that just means the fun I had yeeting wolves to cure mah bois is going to have so much more. and I would personally love it.