What can I do to prepare for probate and to legally to show this woman conned my mother into this?

My mother was diagnosed with stage 4 terminal lung cancer in December. Her care giver was a friend that rented a house from my mother (without a rental agreement) from January 3rd to April 23rd. She shut out all family and friends, saying it was my mother’s wishes. I never got to see her before she died, even after calling the police twice for wellness checks and an aging services by the state. My mother died in April. I started probate and found out that my mother adopted this woman in February and then deeded her three homes in March. I am the only living heir to my mother’s estate.