Unfortunately Minthara is still in Early Access. I also have no clue what restored content Larian was speaking of when they mentioned fixing something blocking her lines and romance, because she has NOTHING in ACT 3.
I think they were referring to her scene about touching the player�s mind, because that was not around for the first couple months of the games release, so she had literally no interaction for the entirety of Act 3 compared with what she has now (I stumbled upon the scene on YouTube because of a modder back then). It could also be referring to her scene about the drow word for love but as far as Im aware that is still bugged.
