As Stephanie says, you should consult with a probate attorney. However, if she was on disability, you may also be able to report her case to the Department of Children and Families for investigation. The Fraud Division handles cases of elder exploitation when the person was receiving Medicaid or Disability.
Meet with probate attorney.
He/she can advise if probate case has been filed.
If not-you could start one to gain power to investigate
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.