Nice video footage! How did you slow it down? The video editing program do it for you?
On her block starts, look to move the entire block back a few inches. She is pretty jammed in there. when you move her back, her hips probably won’t have to come up as high as they are. I find if I put my girls in position so the front foot is slightly behind the hips, they can get out easier and faster. Look to get shins at 45 degrees, and the back leg thigh pointing down to the track. In this shot, her back leg thigh points towards the start line. Play with this a little and see what happens. It will be slightly weird at first, but see if it makes technical improvement.
You may want to check out the South Africa video series drills and block starts download.