You know, at first, I had the same reaction. I figured it couldn't be as easy as that. But let's face reality: the Forsaken are completely inept. From Balthamel who was killed by a walking garden and Aginor who overdrew on the Source like an untrained Wilder, to Be'lal who got backstabbed and killed in a single blow after appearing for all of one scene, to Lanfear who despite being the most powerful woman in the Power and using an angreal, died from being randomly tackled, to Rahvin and Sammael who died from the intervention of another Forsaken on behalf of the Light, to Osan'gar who was randomly killed by a circle at the Cleansing and culminating with Semirhage's poorly thought out plan and subsequent destruction with her master's own Power, the Forsaken were never meant to really be awe inspiring once we got to know them.

Rand almost ripped the Pattern apart through massive usage of balefire, that was the purpose of that scene. Granedal was only a means to that end. She was never consequential.

I expect she's dead. And I expect that this will be the new 'Semirhage was planning to get captured all along' that we witnessed after Knife of Dreams. No, she really did fail that badly.