I really like the idea of her getting captured by the druids after failing the raid. While her connection to the absolute is weakened because of the artefact, you maybe can start asking her questions so she gets back her free will like in act 2. It doesn't feel like the main path to fight for the goblins, especially since you loose a LOT of content in return. And I would rather choose to experience the main content WITH her in my party.
She gets overshadowed by all the other companions, also by Halsin. Especially by him, because you meet both in the goblin camp. It starts with the game giving you the quest of rescuing the druid and killing the 3 goblin leaders. I completely understandt why you would rather help out the bear who is held captive and being tortured by goblins. And when he transformes into a tall daddy with pecs which look like they are chiseled out of stone to rival the mightiest gods, and on top of that he also speeks with animals, and THEN also asks you to kill the goblin leaders - It's a pretty easy choice for the majority.
Why would you want to join the goblins after all of that. Minthara shouldn't even be there due to everything speaking against joining her at this moment. It just feels like the game wants you to fight against her, instead of showing you her real character, or at least giving you a second introduction of her after the raid when she comes to her senses.
Someone who doesn't consume BG3 media outside of the game would assume she is just an npc you should get rid of, because the game tells you so. You can also tell by reading a lot of surprised reddit comments where the player assumed she was just an enemy.
I think it's also different from meeting Karlach when getting introduced to her. You can choose to either help Karlach or fight her, but she tells you her story and you already start to like her. You don't get a proper introduction with Minthara in my opinion.