You might also want to consider that no one knows what the future holds; she may outlive you, so the kindest thing you may do for her now while she still has her senses is to break her of this habit, so to speak. She doesn't need to go into a nursing home and start assaulting the staff - she will suffer worse consequences then, won't she? So if you can possibly help her get these issues under control, if not for your sake, then for hers.