In the wild cats eat the carcases of the prey animals they hunt which consist of raw meat bones and organs. Although its a better choice to feed your cat safely prepared raw meat like chicken or rabbit. Vitamin E can be found in meat.
Be aware that any cat especially an overweight cat is at risk for hepatic lipidosis if they dont eat every day. Whatever your cat eats at present its always worth a try to just offer her some raw cat food. Vitamin E can be found in meat. I advise avoiding any.