So I was thinking about Portal 2 and Greek Mythology recently, and I thought of this-
Based on Greek Mythology, when someone dies, they ascend to the 'heaven', which is a wheat or corn field, with their best friend at their side (which is the companion cube), where they can rest in peace, while they hear the singing of angels and the sound of instruments. This would mean that Chell was killed by the turrets, but it was so sudden that she didn't notice. This could well be true, because there are more references to Greek Mythology, such as the broken turret talking about the Demi-God Prometheus. Discuss please!
*EDIT* Please don't argue, and respect each other's opinions. Also, if you have any more plausible/likely theories, feel free to comment!