(((((Gwen))))) I don't know what to say except you and they didn't need this!!!!
I'm praying all things work together for good, meaning I pray something good does come out of this.
I know this has broken your heart, as well as theirs. Although, try not to personalize it with your past, especially in front of the girls. Try to remain strong, not demanding, no tears (in front of her), emotionally detach as best as you can. If she needs to cry let her cry and talk, just validate her feelings.
One day at a time, one decision at a time with this. May God help you in the days ahead with her and them.