If an estate was opened a copy of the will was filed in the probate court in the county where your cousin resided at her death. You should be able to view a copy of the will by going to the courthouse.
If there was a probate, the will would have been filed with the court and is a matter of public record. If the probate is still open, there might be a way, as a beneficiary, to request an accounting of your cousin's actions as executor.
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The other attorneys are correct that you should be able to obtain a copy of the will and perhaps an inventory from the probate office in the county where she died. I am not sure about MS law but to my knowledge because this is public information the executor would not know you requested the records. If you need a more formal accounting you would of course have to involve the executor.
This is not legal advice nor intended to create an attorney-client relationship. The information provided here is informational in nature only. This attorney may not be licensed in the jurisdiction which you have a question about so the answer could be only general in nature. Visit Steve Zelinger's website: http://www.stevenzelinger.com/