My argument is simple.
It is immoral to send a good person to hell for the sin of worshiping another god.
A girl is born in Pakistan into a Hindu family. Throughout her life she proves over and over again that she is the perfect archetype of a principle centered moral and just person. She has heard about other religions but practices Hindu faith becuse she was born into it.
If Yahweh is the one true God, and heaven and hell exists, then this woman's soul will be tortured in hell for all eternity?
No - I do not believe so and I do not believe the Bible teaches that.
I believe that the Bible teaches that there are three places/conditions our spirits can go to/experience after this life - and all of these places/experiences are temporary.
Paradise, Prison and Hell.
Paradise is where the faithful go - those who lived and died in the Lord - and they are commissioned to spend their time as missionaries to the spirits in Prison - teaching them the truth of the Lord Jesus Christ.
They also receive callings to aid those in mortal life.
Prison sounds bad - but it isn't - it is merely called this because the spirits that dwell there are not free to travel like the spirits in Paradise and Hell - for they need to make a decision before they are free.
Those spirits in Prison are those who did not follow the Lord - either because they decided not to, or they never got the opportunity - yet they were also repentant and honorable while in mortality - and they are taught to by spirits from both Paradise and Hell - each side trying to entice them to their respective sides.
Depending on the choices they make in Prison - these spirits can move to either Paradise or Hell.
Hell is where the spirits of the unrepentant go - and while they suffer the punishment for their sins - they desire to inflict suffering on others.
The spirits in Hell will go and try to convince the spirits in Prison to join them and they may also be called to spread fear and anger to those in mortality.
So - when it comes to your example about the Pakistani girl - if she never accepted the Lord while in mortality - she would go to Prison and if she is as moral and just as you propose - she would see the need to accept the Lord and be forgiven.
She sounds like a person bound for Paradise and eventual eternal life in God's presence.