I don't think there is a perfect answer to this question without some speculation.
First possible factor: Limit of resources - Dredd: "Twelve serious crimes reported every minute. Seventeen thousand per day. We can respond to around six percent." It's stated early in the movie that crime to response ratio is way out of proportion. We can ...
This is set up earlier in the film when they're in the elevator, with Kay stood between Dredd and Anderson.
Anderson: He's thinking of making a move on your gun.
Anderson: He just changed his mind.
Which shows that Kay didn't know that it would be a fatal mistake for a non-Judge to try to use a Lawgiver. Dredd knows there is no ...
I want to pose a different but also similar answer. Mine just contains more of an element of, I think she was SCARED A LOT more than the other answer.
Think about it this way, Based on the fact that slo-mo slows down everything to 1% speed from a person's perspective, says the movie... And she fell 1km from the 200th floor and it took her 18.5 seconds to ...