Rachel wasn't really interested in leading the team. She simply didn't like how Storm assumed she was the leader without asking anyone. If Rachel wanted to lead she wouldn't simply give it to Storm just because she apologized for her behavior.
Just because Rachel has been doing tactics for the X-men, again, doesn't mean she wants to lead. Yes, she gives them her input, and they normally go with her, doesn't mean she is leading. Just giving her valid opinion and when they agree they follow it, but any x-men does this.
All I've seen so far in this last arc is Rachel being herself, and having her friends follow her because they want and not because she is leading them.