Oh well...my heart hurts but what can i do

Deanna • Im a FTM to a baby girl born April 29 (after being told i could not have children) i plan to stay at home with her :) and im pro breastfeeding!
Just found out that my mother (a recovering addict) has decided to pick up her old habbits again...really sucks that she decided to do that (especially a week away from me having her first grandchild) im not gunna lie it hurts (a lot) but i CANNOT let her around my baby if shes not stable in her recovery and shes been headed down this path for a while now :(