Praying for Each Other

I'm requesting prayer for my little sister who is 17.  Last night she reached out to a boy from her past talking about wanting to turn back to doing drugs. She said doing Coke did not make her an addict because she only did it a few times . She's an addict and only 3 months out of rehab.  I feel worried and I know worry is not from the Lord, I believe he has a plan for her and I keep having to remind myself this.  I'm just so worried because she spoke of wanting to run away again. I just wish I could fix this since I'm her older brother, but this is something only her and God can fix.