#2 Beef with The Authority
This is a bit of a natural progression. After being overlooked and being booked in random matches, Nia Jax can have a lot of bones to pick with The Authority.
This is also a useful approach to stall for time with Nia Jax without fading her away. This could result in a bit of a babyface or anti-hero run for Nia Jax as the woman to take down the boss. This storyline has been done before for Brie Bella and Stephanie McMahon but it was a lukewarm storyline at best.
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If WWE is to pull this one off successfully a lot more reality would be required. If Stephanie can't wrestle, a faction could be formed as the protectors of the princess. So instead of being in a head-on rivalry with Stephanie, Nia Jax is actually in rivalry with other superstars. This is a good storyline to follow not only for Nia but also superstars like Dana Brooke or Alicia Fox who aren't currently involved in any storylines.