If there were no Will and Mom died owning the land, it would be divided among the children by intestacy. The problem is not that the Will has been destroyed, it is that the land was deeded over to the daughter. Unless you can prove that the deed was obtained by fraud or undue influence, the daughter owns the land.
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If there is no copy of the will, perhaps the attorney has a copy in his records. If not, you could go to the probate court in a proceeding for probate and attempt to show the daughter intentionally destroyed the will and what its contents were. It is a criminal offense in Alabama to destroy a will after death. However, you state that the deed is in the daughter's name. In that case it is not party of the parent's estate and would not be distributed according to the will in any event.