This doesnt make sense, and it really doesnt have to. it was just a dream.
The drone attempted to take down the girl and her horse with bullets, lasers, and spinning blades. The daring girl and her fearless equine managed to outmanuver and destroy the machine...and then later escape their snowy, authority-over controlled village to the outside world. If there was any life out there, they'd be sure to help this rebel spirit set her people free from living in fear.