The great battle in the snow that Melisandre saw was probably of Jon at Hardhome.
You had a choice Stannis. You chose wrong.
The Princess Shireen of House Baratheon was too pure for this world.
I mean, can Daenerys even fight? Have we ever seen her hold a sword or even a small knife?
Honestly, I would have been sadder to see Missandei die than Daenerys.