The problem is there is nothing that can be done to remediate over fertilized soils in a short time other than removing a great deal of it from the raised beds and diluting it with non-fertile components like peat moss.
As you said there is little rain to leach the soil of excess nutrients but even if there was it would take some time for that to have any impact. Cover crops are questionable since we don't know if they would grow well in it successfully but even if they did it would take some time also.
We don't know much about the soil other than it apparently has crazy toxic numbers from the soil tests. I'm curious as to how these numbers got so high to begin with, what the heck is in it that drove those nutrient levels up so high, even the micros?
Has she consulted with the soil supplier?
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