I wouldn't let her keep the kids and just not see or talk to them. You have a right to see the girls, they are your children as well. Have you texted her and asked if you can come by and pick them up for a visit? Or, if you don't want to contact her, maybe set something up through a mutual friend, her parents, or someone you trust?
I don't think the hate is abnormal. I miss my H very much today. Other days I still miss him but not as much. And, there are still other days when I wonder why in the heck he thinks he has the right to destroy my life this way....and on those days, I am angry and hate him for what he's done. I have put up with his obsessive, paranoid crap for years and I would have stuck with him and reassured him, but he feels compelled to throw me away like I'm yesterday's trash. He has been downright cruel since he told me he wanted "space." It will forever be etched in my mind the sight of him rolling his eyes and sighing as he turned his head away from me every time I walked in his house so I could see him. He had no way to treat me that way. I think it's normal to go through different emotions from day to day as you begin to heal and live a life that you didn't plan on, or want to live that doesn't include them.
Anyway, I'm really sorry that you're missing your girls. I hope you get to see them soon!
M:45 H:48 M:11 No kids BD:Sept'15 EA:Confirmed 1wk later PA: Oct'15 12 '15 2 wk R Just kidding, H wants NC 12 '15 H back w/OW 4 '15 R &still working on it