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As you can see she is not standing with her cannon bones vertical to the ground and is therefore not weighing her heels. So the question arises: "Why is she not weighing her heels?"
The red line is where she is now, indicating a 25 degree hairline, which is not congruent with a ground parallel coffin bone. She would need to grow more vertical toe height (green line) which you will get over time if you back up the toe a little more and trim the underside differently so that she will load her heels more.
Now you can see that the heel is too high and how the pastern angle changes (after rotating the picture) when you take the heel down. This is true in real life as well. Next you will have to take the toe back a good bit (vertical) as to ease break over. But one thing at a time, so the hoof capsule does not become too destabilized, which would cause inflammation
You may not be trimming a scoop into the hoof, but I think I am seeing one that is too far forward. If you want the horse to get better toe height, you need to keep the scoop shorter as indicated in the blue lines.
Here I have marked how high the lateral cartilage is pushed up. This is not a healthy situation. The lateral cartilage becomes pushed up through contraction, high bars and/or a tilted coffin bone (where the palmar processes push the lateral cartilage up.
Blue lines: Where your bars should be. Red lines, this all should be trimmed into a flat surface, having the lowest part in the collateral groove or at the bar and the highest point at the wall. Forward of the green line: Do not trim at all. When you back up the toe, back it up often, but do for now not rasp through the white line.

Once you have trimmed this correctly, she will weigh her heels and her pastern angle will change from its upright position to a more sloped position.

Much improvement. Bars need to come still straighter. A straight bar does not curve under pressure, but keeps the heel more upright by providing a resistance against the under-slinging heel.
This is the Left Hind, but it was the easiest to illustrate. I would start with taking half of that heel down, with other words the area that is marked as a red triangle. Then you have to lower the bars again to keep them in proportion to the heel height.

Side remark: make sure your knife is razor sharp. It makes trimming easier and you get smoother lines. In the picture below you can see how the bar stands upright, meaning it would meet the ground parallel. In your trim it is still stuck to the sole.

This is a picture I just found from a recent student trim. You can see where the bars end. I rotated the picture to match yours above.
I hope you can see here how the heel is angled to be lower towards the frog and higher towards the outside wall, which helps with de-contraction