That's a heartbreaking situation. (One I know all too well.) How I HATE that Organization. How far from Christ-like any one who calls them self a 'Christian' get. How many years of unforgiveness were you sentenced? 

How much punishment did Jesus order for the Samaritan woman (with the five 'husbands')? None. 

How much punishment did Christ lay on woman taken in adultery? None. ("Go and sin no more".) 

How did he tell his followers to treat their 'enemies'? "Love your enemy." 

Where in the scriptures does it say that one's forgiveness comes from a man--any man? Not even the High Priest could forgive Israel's sins. (He could offered the sacrifices, but GOD did the forgiving.) 

What was the reason that Jesus came to earth? To die--as sacrifice for the sins of anyone, good or bad.

I'd be willing to bet that your daughter has never considered any of these scriptural points. After allshe's only allowed to read Watchtower literature and they wanna' look so righteous. Being righteous, following the example of Jesus, just doesn't enter into the equation. Disfellowshipping "wrong doers" (belying the truth at "all sin"), makes them look good. Their own Public Information Office admits that the Organization excommunicates between 50,000 and 70,000 every YEAR!  For how long? Who knows. Until the Elders decide the one they 'cast out to the demons' is good enough for them. 

Forgiveness? Forget it. WTBTS HQ keeps a permanent file of every sinner at Brooklyn Bethel. (Really.) That is never expunged--even after reinstatement. God forgets "as far as east is from west" the sins of his people but JWs don't. 

You know why? Because those who are kicked out or leave of their own volition are a threat to their lies. If their "faithful" followers ever knew what we have come to know the Society would lose even more members. (I recently learned that six of ever 10 children raised as Jehovah's Witnesses will leave them once they become adults.)  

Does any of this help your situation with your daughter? I wish it did, but that's doubtful. Hopefully it will encourage you about the chances that she or her children will one day need your love and support. 

Hugs, Cee Cee