Look, there is no doubt in your brother’s mind (and the rest of your family) that she does not want to be his wife. Your brother is also willing to get her out of his life.
Then…WHY are you guys just waiting for her family to make a move? Yes I agree that her family might be making a tamasha of themselves by creating a scene…BUT with all due respect, your family doesn’t look much better either by not taking any action and allowing her to continue this drama. Why is your family giving her family all the control here?