Do I owe her a response?
NO.
If I do respond, I'd really like to be honest with her about all the lies/hurt/manipulation.
It is not appropriate to dump the lies/hurt/manipulation on her. Speak with a professional listener instead. One who will validate your version and listen rather than get defensive or hurt or place the blame back on to you.
Does that violate NC?
Yes. Try to get as far away from all family members as possible. Find someone neutral to talk to.
Shouldn't the family know the truth?
The family will never know your truth. Your truth is how you see it. No one else has lived in your shoes. You cannot expect others to share the your experience and come away from it changed in the same way you have. Only you have that ability.