Question for everyone:
If Solas had told her the truth, about why he couldn't stay, couldn't be with her....what would your Lavellan do?
Politically? Romance/emotionally? Would she tell other? Keep the secret? I'm curious what people think.
Mine would understand, but move forward. She would seek to restore Elven society, or at least dispel some of the myths and inaccuracies held by the dalish, and she would be open to learning and working with Solas in the future.....but she would understand their romance was over (except for the occasional fade romp perhaps)
I don't think she would tell anyone else...yet...maybe Varric. I don't think she would love another either.
For my Lavellan what solas told her would be surprising but not totally beyond her expectations. I mean, she did catch all the odds and hints Solas leaked. And she'd been made into Herald of Andrastate, got involved into political games to learn how easily fact can be distorted, manipulated. So if the belief and history Dalish holds is mostly not true, it's not that hard to accept.
But my Lavellan will certainly have problem with Solas lying to her, causing all the trouble, and she'd wonder if he is merely using her...maybe not the whole time, but at the beginning?
Regarding the thing he's going to do...what my Lavellan would do still largely depends on what is his plan. But she'd probably act like "you can't just throw me into the whole mess and expect me to leave, pretending nothing happened"
Whatever he want to do, she won't let go so easily, she'd tell him that she will interfere, one way or another.
If Solas's plan is truly beyond her ability to get involved, she'd at least makes it clear that their issues are not settled yet, she'd keep an eye and wait until Solas finish his work.