To save yourself a bit of aggravation do not "explain" things to her. If your WAS is like mine she will go in circles to make her point.
Make clear declarations and let her know NO further discussion will take place regarding the family unit or anything else she has chosen to eliminate from her life. You do not have to explain anything to her (for your own sanity its better you don't).
Have you given her a move out date that she must fund on her own? When are you planning to split the finances?
