After reading this thread I've formulated an amalgamated interpretation of the 'six white horses' symbol. (1)Take the notion of prestige with white horses because of their rarity. (2) Consider 'she' to be in reference to the chariot that is riding the horses (I know the syntax feels awkward in relation to modern English, but it seems appropriate to older generations). (3) Consider chariots to be the vehicle of choice for heavenly ascension--salvation.

I see it as an idealized, physical representation of the salvation that awaits. At least, that's the context I would most likely choose to use it in.