Uh, well, there is this little issue that most legislatures, including the Congress, are empowered to pass laws to regulate the establishment and practices of the courts.
The issue she was writing about had nothing to do about regulating the establishment and practices of the courts.
The fact that she urged separation of powers as a reason to be against a legislature usurping the court's traditional role of regulating the practice of law, including the reasonableness of fees, is not "outrageous".
Besides, separation of powers always comes up when legislatures or executives try to manipulate courts by holding back or limiting funding, for example. There's nothing "outrageous" about bringing it up.