This isn't what I would call a nexus event, this is just an event where all of the main characters show up together, not where their stories meet up. But this doesn't mean her story is close to the end, it's just the beginning of a new arc.
I do plan to introduce a new main character but it's been hard as I've had a lot of other stuff to getting in the way of that. And I don't want to spread myself too thin.