Hatred and bitterness shouldn't be a surprise. People rarely file for D without those two emotions. In my mind, this is actually good news. If she was showing indifference, that would be bad, but she still cares enough about you to put the effort into hatred and bitterness.
Good for you for taking the kids to Grandma.
Hadn't considered that, maybe there is hope then but I have low expectations. Just detaching myself now. We are also waiting for a date for my 8 year old to have heart surgery, I just hope she gets rid of all anger before then as her operation is more important than anything else.