I do feel like a lot of people in this thread have either forgotten or never noticed that you do not need to help her attack the grove to recruit her. You *only* have to not kill her. (Knockout still counts as kill because game.) The tieflings still die off screen, sure, but not by your hand, and the grove survives. Which also means you can have Minthara alongside Karlach and Wyll. ....I still agree you should be able to spare and recruit her while saving the tieflings though. Because if you kill enough of the goblins that should save the tieflings by virtue of their not being a goblin army left to attack them, regardless of whether or not you deal with the leaders.
