Sorry to bump this for anyone who is annoyed by it, but it has been an incredible source of support and help for me, and I wanted to update everyone who cares as to the status.
I finally spoke to my ex for about 2 hours last night. She doesn't even know what Liz's problem is. Liz keeps telling her that I am controlling, but whenever she is pressed for an example, the only one she falls back on is that I force her to wear a coat when it is cold outside, and threaten to take her phone away if she won't follow the rules.
One of the hardest realizations I have ever had to face is what I finally came to grips with last night. Right now, my baby girl is not a good person. As a matter of fact, she is being a pretty terrible human being. She has decided that she wants no part of our family on Christmas (regardless of the fact that she has 2 grandfathers for whom this will likely be their last Christmas).
So, after much consideration, prayer, and counsel, I decided to follow Stacy's advice and giver her exactly what she "wants". She is now staying with her mother exclusively, and she has lost all of the goodies that I provide for her (including cell phone, allowance, etc.). I have made it clear to both her and her mother that i will not be providing once drop of financial support for Liz beyond the required child support that I already pay. I have also made it clear that in a month or two, when she and her mother at at each other's throats and she decides she wants to come home that we will need to sit down together as a family and decide if that is what is best for the family.
If/when she DOES come back, she is well aware of the conditions, and most importantly I have made it very clear that THIS WILL NOT happen again. The next time she walks out of my door for no reason other than her selfishness and desire to do whatever she wants, that it will be THE LAST TIME. The door will not be opened again. I love her. I have told her that every single day, and will continue to do so. However I will not allow her to tear our family apart on her whims, and then decide one day that she wants it back.
In life, you can't have your cake and eat it too - she needs to learn that by falling on her face, and then laying on it for a while.