Carduac arrest , cause linked to damaged brain tissue detatchment . She was due to undergo further surgery soon .
So the cardiac arrest was a direct result of her earlier accident where she lost her eye.
It gets more tragic. Unbeknownst to her, she was on a death sentence that could be called in at any time. I hope she knew nothing of what was happening to her. I would hate to think she died in fear. Mind you, I'd hate to think that of anybody.