My Mom is spending all her money not thinking of nursing home care, medication & funeral arrangements. Advice?

Alcoholic. She is getting demented, angry if she doesn't get her way and very mean to her daughters. Is there anyway we can get the situation under control? She hangs up on us or calls and tells us to do something that she thinks she is having a severe health problem but yet when one of us go there to help she is dressed to the nines and smiling saying it all passed. Years of alcohol has definetly affected her mind but if a doctor tells her to quit drinking she doesn't go back to him. She recently inherited some money thru my step-sister who passed away and Mom is spending it like water. She lives in a Senior Apartment Place and has no other money for her future. All advice with this situation would be helpful.