What was this movie on netflix?

I’m sorry how vague I’m about to be, but it begins with some schoolgirl (I think) fighting something in a warehouse type scene.

Some woman comes into the movie at some point, short hair, bondage looking clothes, uses ropes to kill. Was trained up after her partner disappears (and I think she loses baby?) and becomes a leader for some group who are trying to open some sort of portal. I think. This has broken me and I can’t even remember what happens in scenes. Just flashes lol.