But how does she react if they are all already dead?
The only time i have tryed this, she had exactly same reaction as when you kill them together.
No change at all.
How does Halsin react to finding out that his druids are almost all gone (depending on if Kagha kills the loyal ones?
Weirdly ...
If you massacre whole Grove ... and join Minthara ... he goes for revenge and ambush you at night in your camp.
If you massacre whole Grove ... but also Goblin Camp ... he just tells you that you did what you must, and the Groove is still intact, completely ignoring that the scene is exactly the same.