What are my legal obligations?

I am an only child, 51 years old, married, and run my own small business. My parents have lived down the street from me for 15 years. About 10 years ago (when they entered their mid to late 60s) they became very depressed about aging and began to drink heavily. Also, there has been prescription drug abuse (Benzodiaphines). This has resulted in a significant amount of drama, ugliness and damage that I won't go into here. Needless to say, it has had an extremely negative influence on my life and I will never see my parents as the people who raised me. My dad started showing signs of dementia about 4 years ago and I had to move him to an assisted living facility a year ago. With him gone, my mother was supposed to get herself stronger. They were no longer a loving couple, she had become abusive toward him, and I assumed she would somewhat rebound with him gone. She has seriously declined in the last 6 months and now is at the point where she hardly gets out of bed. She has decided she will no longer care for their home but also will not leave it, she will no longer shop for food or prepare food, and doesn't want to drive any further than the convenience store. She continues to drink heavily and abuse her prescription meds. She stays in a drugged-up, foggy state most of the time. I foresee that she will be hospitalized soon. I DO NOT want to take responsibility for this woman. I am afraid the hospital will try to push her off into my care. It is clear that she will drag down my life: my health, happiness, marriage, business. She is only 76 and her own mother lived to be 96. Therefore, if she lives as long as her mother, she will live throughout the rest of my 50s, 60s and possibly until I am 70 myself. My Question: If she is hospitalized, what are my legal obligations? I have decided I will tell the hospital that I will only do what is legally required of me, and no more. I am in Florida. I am so scared she will be discharged into my care, and ruin my life. She is financially sound, has assets, and an excellent long-term care insurance policy. I have checked the LTC policy and it does NOT have an alcohol or drug exclusion.