I finished Halsins and Thaniels quest before recruiting Minthara so as to be sure it wouldn't bug out. I heard some players had problems with Halsin not coming back to camp.
Just quickly as I know this thread is about Minthara and not Halsin, but for me I had no problems with recruiting them both after knocking Minthara out at the camp after attacking her during dialog and then rescuing her from Moonrise Towers while Halsin was keeping vigil at Art's bedside. Halsin returned to camp just fine after saving Thaniel/Oliver, he just stood around near the Traverller's Chest in the Last Light camp. I'm not sure how he felt about the fact that Thaniel seemed to prefer hanging out with Minthara over at his usurped tent
