I don't know what to do anymore!

So my family member that I believe is on meth isn’t getting any better. Every time I think she is getting better, something happens to make me think otherwise. I am at a loss. I do not know what to do. I know that I can’t sit back and do nothing at all. Especially, when there is babies involved. I am terrified something may happen to her or the babies. Not so much the babies because they are always at either my house or my dad’s house. But I talked to her today and she found out that I talked to her husband, who she is separated from, about maybe setting up an intervention. He told me he didn’t think it would work and may be a waste of my time. Well, she found out that I talked to him and she asked me why. At first I didn’t tell her why but she pushed and pushed so I told her that I called him about setting up an intervention because I love her and believe she needs help. Well, she wasn’t very happy with this and now she tells me I won’t get to see her boys anymore. I asked her why she was being like this and she said because I am not her mother. But I was the one that helped take care of her when her mom wasn’t there. She always promised me she would NEVER keep the boys from me. Now she won’t answer my calls or anything.

I am so lost on what to do. I have called a local drug center that helps with interventions and such. The guy I talked to gave me a lot of good information. But she has to be willing to accept the help and go to rehab, we can’t force her. I really do not think she will willing go to rehab. She always tells me she isn’t doing anything. I think she is still in denial. I really do not know what to do anymore. I know I am so scared and worried. Her kids’ father is just as bad as I think she is. She tells me all the time that she doesn’t want that kind of life for her children and she doesn’t want to be around him. But yet we always see or hear of her being with him; hanging out. I am all for her having the kids’ dad in their lives but I am not sure that it is safe. Again, I am so confused and scared and worried. I do not know what to do.