"Listen, I can change her." lol
It will be interesting if we can play a neutral or partially good hero with Minthara too, a bit crazy idea. Perhaps she is not as evil as it seems at first glance, judging by her ability for mercy, and by the fears that are available if you pass the check in a certain scene. Perhaps for this you will need to get her in another way, keeping her alive in the first act after taking the side of the tieflings, but not planning to play an exclusively "good" role?
She can surrender and offer our character her services, since her mission will be failed and she will be punished even if she returns to the drow. And our party is an opportunity to compete for power together. At the same time, we may have the opportunity to betray her later, and if we do not use her, we will show that we can protect her, she will appreciate it
As an alternative way to get it
but seriously, I think there would be a more clear neutral way to gain her path if she was supposed to be available for a true neutral playthru. Killing a bunch of teiflings and druids kind of feels less neutral, even if there are no witnesses left. I think the dialogue she gives you when she gives you the moontowers dialogue is a little too obvious in regard to her belief in the Absolute for them to change the writing to the extent you are suggesting.
