The withdrawal wont even start until SHE tries to end contact QS.. She hasn't accepted he's gone yet... She's in the height of the addiction right now... you are lucky you put a stop to it, it can go on for YEARS...
You need to ride it out
and those friends of hers aren't helping at ALL... I wonder if her parents would tell them to get lost for you?
Would her parents be willing to call these girls and tell them something like
We are trying to help our daughter and your meddling is making that very difficult, this is OUR daughter and you are just making the situation worse