Unfortunately your D12 sounds like my D14. She was so angry. Now she feigns indifference towards H. They (Both D's) will answer texts from him sometimes and I know from H that they don't really talk to him. I had to give the girls more bad news last week (nothing to do with H) and I let him know so he could talk to them etc. Turns out neither one of them would answer their phones, H had to call the house phone and go through me to talk with them <sigh>.
I'm sure it will get better for your D's, it takes time.
Your right not to be thinking to much out in the distance about what could happen. Your plate is full enough. I know you will do an amazing job of handling everything that comes your way, when it gets there.