Until you realize she somehow survived and Rhonin did not, she got Dalaran out of the deal and suggested the very thing in Varian's ear that Wrathion was working for in MoP.
She could very easily fit the role of a major villian. If they push that angle, that would be the plot twist to top even 'who shot JR'. But no... Kerri- so sorry, Sylva... oh wait! JAINA will be another brooding moody revenge story on the rag as she turns queen bitch and goes psycho.