My Grandma Over 65 Experiences Severe Aggression, Paranoia, Assumes Every

my grandma over 65 experiences severe aggression, paranoia, assumes every one is out to get her, is always saying negative comments and acts out in violence a lot, misplaces items and says they have been stolen will later find them and is convinced the thiefs put it back how should i go about this issue, she attempted to hit me last night so i locked myself in my room and called the crisis hotline they told me to call for an ambulance but i didnt because she is my grandma what should i do about this.