(((bonbon))) I truly don't know what to say as I know this is a very hard time for you. I can only tell you that my heartfelt thoughts go out to you, your daughter, and to your families.
Feeling guilty is a normal process when losing someone. Even when a person leaves us in death and is not an addict or alcoholic, guilty feelings arise. You know in your heart that none of this is your fault. I hope that you come to terms with that soon as guilt is so self defeating. And in your case, I believe it's just unwarranted.
Again, I'm so sorry for your pain.