Flesh in Italian is 'carne' as in our English words 'carnal desire', desire for flesh, 'carnation', flesh-coloured flower, and 'carnival', which means to leave meat. Meat in English now means any flesh (ie. the muscle of animals) but originally, in Old English, 'meat' meant any type of food.
A capitalized Lei can mean a formal you.
The sentence can be translated to She eats beef OR You eat beef (polite, like you sir / madam).
Lei can be capitalized because it starts a sentence, or because it is the formal you, and its verb uses the 3rd person singular in both cases.