In my first playthrough I smacked Kagha, which caused the druids to seal the grove and push the Tieflings out. For some reason, that ruins any prospects of recruiting Minthara, as she's supposedly furious she didn't get to wipe out everyone in the grove. But in theory, the goblins must at least have gotten their claws in the Tieflings, so it's not the same as siding with the druids. There should still be the option to connect with Minthara if one goes this route.
