She is not dead. She has removed her connections to the Fifth World through her contracts with the True Fae. It is... complicated.

[As for that last one...]

Kaien was killed in 2047, during the Darkest Vigil. He and Makoto Kuzunoha, two members of the Searing Wind, stayed behind during an onslaught along the Russian border, giving their brothers and sisters time to retreat.