Awww, sweetie, you've got enough on your plate without having to worry about an addict daughter too.
If you are not sure about the bail/decision, maybe call the court and explain your situation and that you did not understand what the judge said. They will tell you what is happening.
As for your grandkids, my prayers go out that they are protected from any harm. Child Protective Services may have to get involved to ensure they are okay, and they may be better off with them than where they are now. You have so much going on I think it would be too difficult for you to take care of them and you need your health just to deal with all you have happening now.
Just know that I'm sending hugs and prayers from one mama's heart to anothers.