If she goes now, and files the paperwork as soon as she lands, then in all probability she'll be back by Xmas. You both must supply individual letters explaining what went on, why she changed jobs, apologies, your a re married, etc, etc....and make them both long detailed letters, show some effort.
As Pete says, the blame is basically with her, as the rules are clear, and the same for everyone. Ignorance is not a defense.
