True that the choice of words sucks. Also true that it represents Jill's level of maturity and social awareness. She was introduced to those missioncations in developing countries by her dad - who smugly bragged to everyone he encountered about how many children he had. Including, IIRC, at least one woman who had survived several of her own young children.
To this day, I believe that when Jill married Derick, her "dream" of being a missionary was an adolescent fairytale image of Jill the White Missionary delivering babies for the incredibly grateful brown people in some developing country, and bringing souls to Jesus. After all, in her world view, the point of those mission trips is to spread the Word about the Correct Jesus and convince "those people" there to worship him, thus saving their souls from the fires of hell.
So the remark about "bringing one back" is totally in line with the especially insensitive self-centered views of her parents + the theology that's been pounded in to her all her life. Which she spent, until her marriage, cloistered in the filtered, recirculated, and hermetically sealed atmosphere of the Duggar family house.
ETA: Minus the "famous white midwife missionary" fantasy, the above IMO is true of the attitudes of all the Duggarlings including Jessa. Some of them may be more savvy, or at least more guarded, about how they speak, though.