She does a ton of stuff in the Garrison Campaign quests.
Some might say that she did too much in too little time, by receiving the Naaru symbol-thing from Velen himself and then becoming an Exarch alongside names like Akama and Maladaar so quickly.
I really like her character, but I'd actually have preferred if we had seen more of Yrel struggling with the situation and helping us, but less of Yrel reaping all the rewards so quickly. I don't know how far Blizzard is taking her character, but an event like her becoming an Exarch seems more like an end-of-expansion thing, after some major events have taken place.