Carolanne, I'm so sorry that difficult child continues to put you through the ringer.
It is a good thing that you have documented proof that your difficult child is lying, but it's still heartbreaking that she's willing to say and do these horrible things.
I think that your choice to cease all contact and to report her actions to the authorities are the right ones.
Sending prayers and strength your way. Now's your time to focus on you and your younger children.
{{{{Hugs}}}}
Trinity