When she's ready to leave, she'll leave instead of posting bruises.
Posting bruises is a passive aggressive way of bringing the court of public opinion into an argument.
This is a hard truth but a truth nonetheless.
Men who beat women are monsters, straight up.
We all know this.
And if we know this, so do they.
In my personal experience, no matter what you say to someone, you cannot force a decision for them.
They have to make that call themselves.