#1 Move her back to NXT

Let's not beat around the bush on this one.
The calls for Nia Jax to go back down to developmental have reached a feverish pitch after she injured Lynch on Raw and while some of that is ill-placed anger, there is still a great legitimacy to it. In fact, with Jax still very much green in the way of ring work, she could very much benefit from some time in NXT.
Look who just shut down all of Tony Khan's critics! More HERE.
Beyond that, WWE needs to send a message to Jax and the rest of the locker room that this kind of thing will not be tolerated and that there are consequences for messing up like this in the ring. Furthermore, WWE needs to emphasize that safety is important above all else and nothing would do that more than putting Jax back in NXT.