I don't think she can die. Being a herald and all doesn't that mean she couldn't die? Because in the prologue of The Way of Kings, Kalak says on page 1 of the prolouge "Even after all these centuries, seeing a thunderclast up close made Kalak shiver... He'd been killed by hands like those before... Of course, dying rarely was" and then he describes where he goes when he dies where "The flesh burn. The fire. The pain over and over..." This I think, proves she MIGHT NOT BE DEAD! This is just my opinion so yeah.
