I think I heard you mention Clinton Anderson? And I see she flexes the pony... I would do those desensitizing things with the pony's nose partially flexed, that way if she decides to spook, you can bring her around in a one rein stop.
I also agree lessons will help further her skills, but I feel you are on the right track.
Good luck, and you'll have to post more videos of their progress together!
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