Please explain this to me:

"Kumari: the head priest takes the children and selects one. From what we have heard, they keep them in a dark room and perform prayers rituals, which they don't show us. They look for the signs, and look at the qualities and make their selection (32 physical perfections)."

"For centuries, Kumari have watched over Kathmandu. To maintain her purity, Kumari's feet must never touch the ground..."

"...she cannot go anywhere."

https://www.youtube.com/watch?v=A7gLC4l5Nmo