well, then it is her problem and no one else’s business.
To a large extent, you are correct. And if this had been a purely civil matter, or not one of violence, I'd be agreeing with you completely.
Person A plows into Person B's car, then offers Person B $20,000 not to press charges. Person B accepts. Case closed.
But Person A beats Person B, then offers Person B $20,000 not to press charges. Person B accepts. That's sort of like buying an indulgence for a great sin. Doesn't sit right with me. Your mileage may vary.