This is actually a question that reflects more about the person asking the question than the victim. Regardless of if a victim chooses to stay or leave, they are the one who is going to bear the consequences of that decision for the rest of their lives.
The person deciding they are ready to leave will suffer if the resources they thought would be there don't pan out. They will also be the one who suffers physically if they choose to stay and another fight ends in physical altercation.
The victim is the one who will suffer when their lives are flipped upside down until they sort out their new living arrangements. The victim is the one who needs to endure the consequences of each step along the way. The decision about what to do is going to change the victims life for the rest of the time they are alive.
In contrast, the 'helper' will suffer only a tiny fragment of the consequences. The time a person spends 'helping' is always limited by the time and energy they are willing to invest. At anytime if the helper decides that it costs too much emotionally or otherwise, then they always have the option of leaving. A victim who has chosen to leave can't leave their own life even if it all becomes too much.
So in all honesty if this is a question you've found yourself asking, it means that you have expectations of a victim that are not being met and this isn't the victims fault. Your role as a helper needs to be reconsidered and it is likely that you need to listen move if you want to help create a plan that is actually useful to the victim.