King Ghidorah's Unexplained Cameo

I always just took it as her seeing a invading monster coming to take over the world and it was never supposed to be Ghidorah it’s just not wanting to play it’s hand with MechaG too early. Although I do like your idea of her seeing a potential future which wouldn’t be too dissimilar to Terror of Mechagodzilla where Katsura has a vision of Manda who within canon hasn’t attacked yet. Or who knows maybe they’re both just crazy!