Her heels have been her main base of support with her soles so thin and her P3s on the ground (the breakover really hurt her). The four-point really takes advantage of her happy heels, moves the breakover back so that she isn't spending more time on the part that hurts.
The gel is copper infused so it should keep any thrush down. Normally the gel is paired with a styrofoam pad that is level with the ground. Russ filled in with the gel, but kept is just below level of the shoe with the ground, so that it acts more like a sole and minimizes impact to her tender hooves.