Before I go ahead and answer this question, I'd like to ask you a question. Would you eat it? Put yourself in that situation and think what you would have done. You have very conveniently put a "dead cow" in the situation you've given her because you don't want her to be like " I don't have it in me to kill a cow even if the situation demands it". Anyways, lets keep that aside and come back to the situation and more importantly, my question to you. Would you, as a meat eater, eat it? Would you, WITH YOUR BARE HANDS be able to skin it completely , then remove all its organs, heart, muscles, tendons, intestines, lungs,liver, kidney, penis/breast, drain all the blood, urine and poop from it not to mention the body fluid too(WITH YOUR BARE HANDS, remember you're the one who said and I quote "on a desert island with absolutely NOTHING there i.e. no people, plants, trees, etc, just sand"), and then separate all the flesh (again WITH YOUR BARE HANDS, there are NO knives in your situation) from this whole concoction of God given organs, blood and body fluid( and then eat it absolutely RAW with all the BLOOD and body fluid on it?(remember again, you're the one who said there's no trees too, so you can't cook it without firewood) . Let me guess! You wouldn't. If you, being a meat eater yourself, cannot eat it, then how can you expect her to drop her vegetarianism all of a sudden and eat that cow after performing the above stated process???