I hope, you realise that Loviatar is a lawful evil goddess. So that would make Minthara change one evil goddess for another - not much of an redemption arc there.
Of course! But if she will be free of the tadpole, she will need a new God as a cleric. Unless the developers decide to change she class after that
Eilistraee was an example of the arc of redemption, Loviavar - if the player is comfortable with the lawful evil playstyle.
I remembered about her because her priest is in the goblin camp, it can be any evil or neutral God
It's hard to say when we don't know the developers' plans