I am another mom who let her child come home. She relapsed within hours of returning home. Nothing changes when nothing changes.
Just curious, where does she get the funds to fly from island to island and then make contact with dealers, given she is unemployed and all that? She sounds quite resourceful to me. Remember you are not her only option.
As an aside, my daughter eventually got clean on her own, outside of my home and has remained so. Tomorrow will take care of itself.