1. Lacto-ovo means milk/eggs. :) Many nutrients can only be found in animal products, there's no getting away from that.
2. It's better than nothing! :)
3. The flush forces the liver to work hard. Raw foods also force it to work hard. They're very cold (in Ayurvedic terms) on the entire digestive system, which includes the liver. So it's best to at least steam your foods.