Madison, the victim, told her story online and was met with the vitriolic, violent hatred you'd expect from a woman pointing out the misogyny of the internet's favorite tech boy. She shared her story mostly to warn other women what to expect from working there as well as a step in her own healing process.
She never wanted to sue them since they are much wealthier than her and she kind of just wanted to move past that part of her life. Linus Media Group isn't going to sue her for defamation because even if they can win, as they claim (which I personally have my own doubts, but I'm an outside observer with no legal education), it's still a very bad look.
Since no parties are bringing litigation to a court, the litigation happens in the court of public opinion.