I think I watched this 4-5 years ago on Netflix. The protagonist is a young woman, probably somewhere in her 20s or 30s who gets a job at a facility (government?) where they're doing something with gifted children that involves them being kept in an underground complex controlled by a computer system. I think I remember a sequence showing her having to traverse multiple corridors and elevators to get to the facility. As I recall it, the children are oddly quiet and passive. Early in the film, while in the facility overnight, she runs into some of the children, who seem to be sleepwalking, with the marketing suggesting that the children are going to turn out to be evil. I don't think I wound up watching much further than that, but I remember looking the film up at the time and finding out that the children are later revealed to not be malevolent, but there is something else going on at the facility that's not good.
My memory is that the protagonist is Caucasian with long hair, and I think most of the children were Caucasian.