The cocaine in tgis situation is now a coping drug/process. Its how shes coped in high good or highly bad situations. Its user feels excited tgey take it, they feel alone they take it. Tge fact its come out means she is ready to change and deep down is asking fir care and support. The less freaked out you get the better as she may stumbke as an alcholic will after rehab but if you express belief in her as your son dies ahe will get stringer have better rekatuons and tgat clutch will dissappear. Love will solve this one. She clearly dies care too as its self infliction of pain rather than inflicting otgers… Sadly eventually we all need help and some cannot express as well.
Much love and good luck with the changes. After every storm tge waves settle and the sea views are stunning.