She is retrieving her family from the smoke and flames.

...their own stall since it's where they feel safe.

In stable fires (and my late wife's horse was through a massive one) pretty much every horse will run back in, even in the face of heavy flames. Our vet, the stable owner (100+ horses btw for each of 40+ years) and others agree that this terrible thing horses do has killed many of them over the years. In fact, unless one can get a horse bridled pretty quickly after the fire breaks out AND literally dragged outside and TIED to a strong post, the horse will break loose from a handler and run back in. Sadly, no horse is usually, if ever, in bridle when locked in their stall as the bridle may hook on projections in the stall and they do interfere with hay munching.

In the fire our American Saddlebred survived, the professional grooms ran into the fire, dragged our boy out and tied his bridle/harness to a nearby telephone pole. He was one of the few survivors left standing in the morning light where 20+ polo ponies at the Oak Brook, IL polo facility died that fateful evening due to a lightning strike on the huge and temporary circus tent-sized stable.