"White tends to represent something righteous or pure in the Bible. The fact the horseman of the apocalypse rides it may show that he’s operating under a pseudo-righteousness to deceive more people

The horse of the apocalypse actually appears to Zechariah in a vision (Zechariah 1:8). And although Jesus and the rider of this particular horse share many similarities, the rider of this horse, who wears a crown, most likely represents a pseudo-christ of some sort. A political leader bent on conquest"

And the fact thay she is wearing a black/dark green cloak...