I heard that the reason they made her put her hands like that was a Timelord form of disgrace. And that she was stuck in that limbo forever, until her and the other disgraced Timelords became the first weeping angels. Monsters forced into feeding of time energy, as it used to run through their veins now their veins were stone they needed to get it other ways.
I don’t even care if that’s the real reason or not because it’s awesomehorrifying.
And in the fourth gif you see her nodding because even she knows who her son is. She raised that boy who has changed so many times, raised him from birth and knew who he was. She knew what his choice would be and approved, even if inevitably it would be her death. You see his eyes widen in the sixth gif because he realizes that to end everything, he will be doing it not just to the timelords but to the face of his mother. It will be her that he is sending back and oh, it hurts him. The grief and the pain… and his mothers acceptance of it. You can see the tear in her yes even as she knows her son will do what’s right.