Surely that's a clash of definitions, though? The energy that "cannot be destroyed" is a physical quantity (or more precisely a set of physical quantities, measuring electrical energy, heat energy and so forth, that can be shown to balance against each other in an isolated system), but the "energy" in Pixie's definition of life is rather closer to an abstract concept of vigour, livelihood, activity etc. I don't see that you can equate the two. Things can have energy without having life or consciousness, or even any sort of organised structure, so that the "energy" that outlasts death doesn't have to retain any information about the person/ animal who's died. It could just as easily survive as nothing more than heat. ("could", not "does".)
I'm not saying that there definitely isn't something more to life that outlasts death; rather that if there is then it's got little to do with energy or conservation of energy.