I'm so sorry for your situation and struggles. I understand your husband's opinion on the detox game, however, if she is using a strong narcotic such as heroin,it could be very unsafe to detox alone and without medical supervision. Aside from feeling like the worst case of the flu that you ever thought was humanly possible, there is also a high risk of seizures. I understand not wanting to enable, but just make sure to be safe.
I hope things getting better. Keep coming here- the support I have found here is like no other. Sending prayers to your family.