I don't know the title of it but there is a girl who is at this party and sees someone get stabbed and screams but no one else seems aware of the situation. She then sees the man again who did the stabbing appear and disappear while looking out the windows of a café or something. I think her mom calls her and tells her not to come home and she goes home to find a monster there, kind of looks like a giant blood sucking worm? The disappearing man appears at her house and kills the monster. He tells her that her mom was part of something and that the blood runs in her. I remember something like how there is a group of them in a room full of monsters and they're outmatched but werewolves comes to the rescue?

Really need help finding the title of this movie. It's killing me not knowing what it is.

This is a wild guess. I saw a similar description elsewhere, to which an answerer responded:

The Mortal Instruments: City of Bones (2013)
From Wikipedia:
New York City teenager Clary Fray (Lily Collins) begins seeing a strange symbol, worrying her mother, Jocelyn (Lena Headey), and her mother's friend, Luke Garroway (Aidan Turner). Later, at a nightclub with her friend, Simon Lewis (Robert Sheehan), Clary is the only person able to see Jace Wayland (Jamie Campbell Bower) killing a man. Meanwhile, Jocelyn is abducted by two men, Emil Pangborn (Kevin Durand) and Samuel Blackwell (Robert Maillet), but leaves Clary a message warning her about someone named Valentine. Jocelyn drinks a potion, putting her in a comatose state. Returning home, Clary is attacked by a demon, but Jace appears and kills it. He is a Shadowhunter, a warrior that slays demons. Jocelyn was also Shadowhunter, and Clary has inherited her powers, including the ability to use runes.


The Mortal Instruments: City of Bones - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/The_Mortal_Instruments:_City_of_Bones)

Yes! Omg. Thank you so much. <33

Yes! Omg. Thank you so much. <33

You're welcome!