That's just another quest that sits in my journal, along with ex-Jarl of Falkreath and Oilfina Greymane's quests.

That's exactly how i feel. By the time i finish a quest line, it feels like i'm still a new member, yet i'm appointed to be the leader of that faction. Maye a longer quest line would make me feel like i really am fit to be the leader.

Panic over. I used pickrefbyid to summons her into existence again, and picked up the quests at Diplomatic Immunity.

And now I've gone as far as Alduin's Bane. No disappointments there. Quite the opposite. A big shout out for whoever wrote the plot line.