Translation:She does not eat the ingredient on the plate.
If you're looking for a 'well-established" approach to lamguage learning - sign up for a class or something.. i love the way duolingo builds up the knwledge from previous lessons. We are looking at a grammatical structure and it is shown in a brilliant way. Think alittle before hating next time
It actually is a well-established principle of language learning to start with sentences that help you practice the grammatical structure of the lesson. It doesn't matter if it says all elephants are polka-dotted as long as it helps to understand the grammar. Anyone who has a problem with Duolingo should go to "Report a Problem" or "Support", not clutter up the discussion page.
"I eat" can mean that you usually eat for example meat. But "I am eating" means you are eating just now your meal.
For example you could say "I am not eating that!" meaning you don't want to eat the food that has been offered. Or "I do not eat meat" would mean that you are vegetarian and don't ever eat meat.
Lei is definitely translated as you, and it's probably what we should be learning. Lei is the formal/polite singular you, tu is the informal/familiar singular you. You distinguish between meanings by using a capital letter for the formal. However for strictly Duolingo purposes, lei means she. Also Loro is formal plural you, whereas voi is informal plural you. The formal/polite version is always what you should use when addressing strangers/elders, until they specifically give you permission to use informal language. That means you've made a friend! :P Hope I helped :)