Your rights are governed by the documents naming you as executrix - you need to talke to two attorneys, first the one who drafted your mother's estate planning documents and second the attorney handling the divorce. I'm assuming they were legally separated before she passed and before the divorce was finalized, but the effect of her death on her estate and divorce will turn largely on the documents drafted by the attorneys working with her.
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You can always sue, the real question is can you prevail. First, "asset protection" is not a recognized area of law, so you need to know if you were dealing with an attorney. Check with the New Mexico state bar association to see if the planner you were working with is an attorney. If she is, you can pursue a complaint to the bar association. If she isn't you might want to report her to the bar association for unauthorized practice of law and you might also contact your local Attorney...
In California the Probate Court requires originals.