1. David was on his roof, NOT Bathsheba
Bathsheba was in a place where David could see her. Could be the roof of her house.
2. Bathsheba was washing as was the custom of Jewish women for purification (which lasted at least a week)
We don't know that.
3. The Bible says NOTHING of her being nude - women washed portions of their body at a time, she could have been washing her feet for all we know
I am inclined to believe she was naked even if the Bible doesn't specifically say that. It says that David saw how beautiful she was while she was taking a bath. It's kind of implied that she was naked.
4. David took Bathsheba and then sent her back home defiled when he was done using her
David sent some of his servants for Bathsheba. The Bible says "she came to him". No force implied. You can't take a married woman out of her house using force and bring her to the king without raising suspicions among people.
5. Bathsheba could have been stoned for adultery and shamed her entire family when she became pregnant
Yes. The shame would fall over the king too. All jews are supposed to obey God's commandments, not only Bathsheba. That's why david gets so desperate in trying to make Uriah have sex with Bathsheba. People expect the king to obey God, not to give in to lust like someone who can't control his hormones.
6. Bathsheba put her life in King David's hands when she sent word to him that he got her pregnant
Since she didn't got pregnant alone...
7. Bathsheba mourned for her husband Uriah when David had him killed
Yes.
8. God told Nathan the prophet that David was guilty of stealing "a poor man's ewe" and of murdering Uriah
Yes. God wasn't pleased with what David did. Sleeping with the wife of another man and than kill the man to hide what he did. The moral is: you can't hide from God.
9. God held David accountable and his household was cursed with violence
Yes. It's the consequence of sin.
10. Bathsheba was not held accountable by God for David's sin, God said she was stolen (taken against her will) She wasn't seduced or led into sin -- she was STOLEN.
She wasn't held accountable for her sin because David is the instigator of all this. The question in the opening is focusing on Bathsheba too. It does not say she was stolen. It says "she came to him/to David".