I agree with most everyone. Finishing Spanish 3 in high school is the mimimum selective colleges are looking for. Completing Spanish 4 is better than doing one year of a different foreign language. She’s unlikely to like Italian any better than Spanish unless the teachers are much better. Having studied a bit of both they are structurally quite similar. FWIW the fourth year of a language in high school is often the year where you can finally have some fun reading books and such and not just learning vocabulary and grammar.
FWIW, my son had finished Latin 3 sophomore year, but suffered through Latin 4 because he knew the colleges he was targeting would want it. I don’t think he ever got above a B in Latin, but he got into some very selective colleges anyway.