By the way, I do realize that the concept of community property is more complex than my simple description. I kept it simple due to a lack of any sort of details.
As to the child support; last I checked this as a forum on law and not morals. While I will agree that she is morally obligated to provide financial support for her children she isn't, currently obligated until there is a court order. This is the same thing that we tell men. It having been 7 months since she split, however, makes her case about as sound as a sieve.