It is possible. But her turning good would require character development mirroring shadowhearts
Maybe. But Shadow Heart is a half-elf, and Minthara is a drow.
There is a theory that Shadow Heart in the future can be both good and evil depending on the decisions of the player, and besides the fact that they are clerics, they are completely different
However, this may be the solution, yes. Conflicts are just like Karlach and Mizora - both are available, but a conflict is needed so as not to be duplicated.
But here I do not see that they strongly interfere with one another, the characters are similar only in that both clerics
