I am sorry for what your going through I am not a doctor and this, is not intended to be medical advice.
I know a lot of times addicts have undiagnoised mental disorders and I have seen many post that the drug problem needs addressed first then later they find the other issue.
Your wife's case if different she already has the diagnosis do you know if the place she is at requested you send her the med? I have a diagnosis of bipolar disorder and I know that many of the meds cannot be stopped cold turkey. I am not familiar with the one she takes.
I will keep you and you precious children and your wife in my prayers.