Technical malfunction
Dry, short grass on sunbaked soil won't show much of anything from an aerial photo.
Vehicle doesn't appear to have hit the building at any sort of speed. The fence/hedge wouldn't have stopped a golf cart.
Driver has been rightly charged on the immediate evidence, but technical evidence from the car will paint a very back and white picture of what actually happened.
Looking at Street view, she's gone down Camp Road, possibly swerved left to negotiate an oncoming car on the right hand bend and driven straight through the fence to the left of the entry gate.
It's possible that inappropriate speed played a part, but there isn't a lot of space for reacting, and the shock of hitting the railing won't have helped any.
'Drive' down the road on Streetview and you can see how easyily it would have happened.
Not making excuses for the driver, but it was inevitable looking at the road.