She won't go down without a fight.
The tragic loss of her business partner, Will Garder, made Diane vulnerable as the firm's sole managing partner. For some this might seem intimidating, even frightening, but that is what makes Diane the person she is. In Season 5, Episode 17, Diane and David Lee engage in a power struggle over the firm. When David makes a run at trying to remove Diane from power, Chicago's top litigator let Lee know that she isn't going anywhere. In fact, she even offered up some safety advice telling David to "fasten your seatbelts. We’re heading for a lot of hurt.”