hello

You are not alone, I have exatly the same issue on ALL my saves
after the update Laezel is now dead in camp for some reason and her quest is closed, even though I convinced both her and shadowheart to stand down many hours ago.

before patch 3 (during patch 1 and patch 2) my issue was:

Finished every other quest in Act 1/ act2 except the Creche but Lazael shows up as yellow outlined on my screen. When I ask her to join the party she says yes but never appears in the party. Even after leaving camp she is still not there.

to be honest it's super frustrating to have wait many weeks hoping a bug solution and finally discover that Larian prefer to "kill" this quest....

So I have no choice to continue the game without her, or restart completly a new game....

not cool at all