Only practice can take her English at the desired level somewhat quickly. I'm trilingual with a forth language under my belt and in my opinion she has to spend

Only practice can take her English at the desired level somewhat quickly. I'm trilingual with a forth language under my belt and in my opinion she has to spend as much time as possible with native English speakers (or with people who speak English very well). Unfortunately you aren't a native speaker so more than likely she's exposed to Italian more than English. This is a major hurdle. Reading is good. Listening is great but nothing beats discussing. One-on-one conversation classes could be great. You could look for people willing to practice Italian in exchange for English practice. Check "meetup"s in your region so that you can meet people and discuss in English (in whatever topic that is of interest to you). There's no doubt that she has to study grammar and vocabulary. She has to read a lot (It is important to use tools/apps/dictionaries that can speak the searched words). But I would concentrate heavily on English communication.