The Sharia limits your discretion on the distribution of your wealth after your death to a third of your estate. If you stated in your will that all your money is to go to your wife, she will receive a third of the estate, and she will then receive her Sharia-defined share of the inheritance from the remaining two-thirds. In respect to the rest of the inheritance, she can only receive from it as much as the other heirs agree to pass over to her.