I'm so sorry. That sounds just heartbreaking. I have no idea how I'd respond to my own child and addiction. It is one of my greatest fears
I do not understand why she is telling you this stuff though. I never told my mom these things - it would never occur to me. They must be crazy hard to hear. It is OK to put up a boundary around that. You can say to your daughter "I'll have lunch with you any time but I will not listen to stories of your escapades. If you start in the subject will change or I'll get up and leave."
Prayers for you and Amber both. She is very young and there is hope for everyone.