Abusive Relationship

Although I am not the person struggling, my friend is in an emotionally abusi e relationship. I've been there for her, but she is so far in it that she can't see how bad it's gotten. He has pushed her before but not in a while. Any advice on how to handle the situation?? Any thoughts appreciated from those who've experienced it or friends of those who have experienced it .. ❤️️ just want her happy and healthy, but I know it's a patience game.