Whoo boy, yeah you are in a tough spot.
You are asking your daughter to stand with her family on this issue, and we all know you are right.
But let's look at things from your daughters perspective for a moment.
First of all there's the overwhelming amount of peer pressure she is under since she obviously wants this boys approval.
She might not crave this as much if her father was as attentive as he could be.
Then there's the fact that she is still a child, and has not developed a full appreciation for the exact consequences for her acton's or her decisions.
But since it's the boy who shot your son, and she can't control his actions, I guess it's still OK to blame her if she doesn't know who's side to take here.
Look.
She's confused. She needs guidance from her family.
Of course she'll lie to you, but you can't blame her for that.
If you want her to have strong loyalties toward her family, then you have to give her good reason to.
This is something that is earned. It's not just a birthright.