Well, I think you couldn't do better than read the book - it's pretty widely available. Also quite interesting to read the mass of customer reviews of it on Amazon. Basically it's where the child's senses (not just sight, hearing, etc., but touch, balance, body-sense generally) are either oversensitive or undersensitive & therefore their ability to use their senses to orient themselves in the world is disordered. Example which rang true for me is child who cannot tell you that a toothbrush is bristly by looking at it - would have to feel it to know - and as a result of that goes through life handling, touching, fiddling, breaking - that's an undersensitive child. Think your dd sounds the opposite - but it's the other side of the same coin.
The book's big recommendation is occupational therapy, to address the physical issues - idea being if you get the child more in synch with its own senses then other, more intangible, things may fall into place too. There's a thread somewhere else about someone looking for an OT (not you is it?!) in London - might be of use?
Book also has ideas for exercises & games parents/schools could do without formal OT - eg trampolining supposed to be good.