"She would be better without you."
Translation:Lei starebbe meglio senza te.
"When followed by an adjective, essere expresses a quality, or a condition:
Lui è bravo = he is clever
Io ero stanco = I was tired
Loro saranno pronti = they will be ready or they may be ready (dubitative shade of meaning)
(voi) siete cordiali = you are cheerful
"The verb stare is also commonly used to express and/or to inquire about health conditions (to be, to feel), either alone or [emphasis added]followed by an adverb, such as the following ones:
bene (well, fine),
male (sick, not well),
benissimo (very well),
malissimo (very bad),
and so on."