Escape.

Even if she tried to free the others, she may not have enough time to conduct an escape. And who knows what they'll do. Many of these girls were already mentally unstable from being abused. She didn't want to risk a chaotic situation. As heartless as it was, she made her attempt alone. She'll be back in better shape later. She headed for the entrance where she was taken, but as she approached the hall, she felt the collar around her neck tighten. The light on it changing color, turning bright red as it started to beep loudly. She stopped dead in her tracks, only a few feet away from the front door, as the beeping seemed to occur more frequently the closer she got, slowing down and quieting down if she stepped back.

Of course. The collar would do something if she tried. That something was unknown, but it was certainly bad. She could attempt to run it, or turn back and try to remove the collar.