So... I did the Peace Conference in Season Unending. I also had a quest to do for Jarl Elisif the Incompetent. I go to report to her about helping her people (so I can become Thane of Solitude) and it points me back to High Hrothgar. The entire Imperial entourage (including Elenwen, who was thrown out before the conference started) was just standing there. I leave HR, to look for a word wall and I come back to find out they're gone. So I return to Solitude to be Thaned but she's not there. I return to HR and they're not there either.

So...where did they go? (I can't reload a save since all my saves are post-PC.)

You a Thalmor lover through Elenwen out, now that's funny. As for you problem you might try a 30 day wait and see if she shows up in Solitude.

Odd that they would all just vanish.

By any chance have you left the area, traveled to another area far away & shut the game down & then back on? If someone usually vanished, this seems to work oddly.

I threw her out to please Ulfric. But that has to do with how I role play a Thalmor agent/sympathizer.

I've traveled all over Skyrim, ended up in the College of Winterhold. I saved and quit there when I went to sleep last night...and they're still not back. I *hope* that they come back.