I'm Scared, My Daughters Addiction

I am almost 12 years clean from a 10 year coke addiction. I remember well the struggles I had when quitting, I was actually very fortunate though, I never went through rehab, or went to treatment of any sort for that matter. I woke up one day and walked away. I walked away from everything in my life (except my children)........my husband, my home, my job, nearly all our belongings... I had had enough. My husband died of a drug overdose 3 months later.
Now to get to my daughter... she is now 24. She has been living in KY which apparently has a huge heroin problem and she along with it. She started using about a year ago and hit rock bottom fast. And I do mean rock bottom.... she became the complete stereotype of a heroin addict....stole from family, living on the street, sold her body.... you get the picture. Having been an addict myself and an expert at tough love I have never enabled her. She reached out several times saying she was done and wanted help, so I would offer treatment, and she would decline... or she would go and check herself out as soon as detox was finished. Finally though, she went in and stayed! She received her thirty day chip Friday and is being released on Monday!!! After a lot of thought and discussion we have decided her best chance at staying clean is to come live with me and her adoptive Dad in Texas.... 900 miles from all her connections. I am scared to death!!!! For a thousand reasons I am scared to death! Can anyone give me some reassurance that moving here and completely starting over is her best chance? Everything I am seeing from her tells me that she is ready for the change, but I have read so many heroin horror stories and I have never dealt with anything but alcoholism, coke and prescription drug addiction so I don't know what really to expect.
Everywhere you go...you take the monkey with you...wanting to stay clean and doing so....are two different things. ...it will always be up to her...no matter where she lives. ..it's up to you to decide if you want to watch it...or live with it. ...we're addicts for life. ...just cause your clean 10 years doesn't mean you'll stay that way...you know your not responsible for her addiction. ...or her choice of poison. ..this isn't about her...It's about you. ..and what your willing to live with...