It would be advisable to contact the district attorney's office and also Adult Protective Services.  Elder abuse includes the financial fraud you have described.  Elder abuse of this type is a criminal matter for the district attorney to pursue.  Adult Protective Services  can also intercede on behalf of your grandmother.Fraud is both criminal and civil (lawsuit).  Your aunt is liable for any funds she has misappropriated.  A lawsuit can be filed against her for fraud to recover those funds.  This civil case is separate from the criminal case for fraud  which the district attorney's office can pursue.