This will sound insane but I've used it for my ADHD and I know a few people who used it on their autistic children or students and it works fairly often to help improve focus - get her a koosh ball or a stress ball or some other textured hand sized squishable object and have her try working with that in her hand. I'd love to tell you why it works, but I have no idea.
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Heather

"I distrust those people who know so well what God wants them to do because I notice it always coincides with their own desires." -Susan B Anthony