How can i (legally) help my 21 yr old daughter stop abusing roxies when she refuses help. i live in florida.?

she has an eighteen month old baby girl. They live with my parents. My parents supply her with a car and money and are being naive. My stepdad is the sheriff's father. I have begged them to help her and not give her money. she and her boyfriend steal from them and they ignore it. i went to live with them to help my daughter recover from her addiction, she admitted to me thta she is addicted. she asked me for help. I told her it will not be easy and she would probably not like me a lot of the time but i could help. she agreed. I made arrangements for her to see a psychiciatrist for counsel and direction. The next thing i know, my mother gave my daughter her credit card to pay an up front fee of $250 to the doctor who supplies her friends the roxies. the very source. I told my mother she was killing my daughter because she will not listen to me. After my daughter stole money from my mother's purse and my debit card yesterday, i confronted her and everybody turned against me, my parents made me leave. They are giving her a home to live in in a couple of weeks, so she'll have no supervision. her boyfriend is weak and he does drugs with her sometimes. They both aked me for help, but now she's mad because i told my parents about her addiction. i explained that i had to to help her not betray her. now she denies ever telling me she had a problem, says it's my fault that she's screwed up in the head (and i'm sure that comes from my mother), and she will be going to see the quack soon to get the pills. I've speculated for a long time because she suffers migraines, stomache aches, muscle aches, fatigue, moodiness, and she's lost wieght. she claims she only snorts one a day. i don't know what my rights are in florida. how can i help my daughter and granddaughter? can i baker act her or not? who should i talk to to find out what to do. i know hrs doesn't do any good.