The hardest thing to do when riding green horses is .........nothing!
At this stage I would be allowing her to find her own way. Yes, you need to keep her balanced and forward but, do not try to place her, let her sort herself out.
I don't think you are getting her into a fence to deep, not at this height.
I like the video Jaydee posted. Piggy French is very good. Notice how short the distances were through the grid, gets a horse really using itself and picking up.
Unless a horse is advanced in its jumping I always start a grid at the trot because it is easier for them to adjust and does make them work harder.