I haven't had much experience with a horse that paws chronically like your horse does but usually if a horse paws either hen I'm in the saddle or on the ground paws I treat it just like if they weren't standing still and make them work. Hard. Get them to realize that it's much more comfortable and easier to stand still and quite then all the moving about and pawing they were doing before. If your in the saddle and it happens I would suggest trotting circles, serpentines, figure eights, squares...mix it up and don't drill on just one pattern but keep them moving until they start acting like they want to slow down, then work them about five minutes past that breaking point. You could also do side passes down the rail--or trail--roll backs--sometimes I will do canter to a place, stop, roll back, then just walk or trot off then stop at another place, roll back and canter, that way the speed is varied and it keeps them on their toes. You can also try backing her up a couple steps or yielding her hind quarters when she does this although I find this doesn't really work in the long run and if you are already having problems with her rearing I don't think you want to try backing her up.
Hope this helps :)
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