Take a deep breath and try to relax. This is the best thing that can happen in your situation. Time and space are the only things that turn this around. Do not try to stop her. Right now she feels like a trapped animal in a cage. The longer it takes for you to open the cage door the more she will resent you. Open the cage door and let her run free.
Speak to a lawyer about the ramifications of her leaving the house.
I know that you feel like this is the end but it is only the beginning. How you interact with her through the process will play a major role.
Stay strong my friend! You will survive and thrive if you choose to.
