What do you want us to say...you've tried DCF, you are on a page asking lawyers. Of course we are going to tell you to get a lawyer. These cases are difficult to prove, I won't tell you otherwise. But if you are going to seek redress through the justice system you need a lawyer, and since you are on here asking lawyers, you must still be wanting to use the courts. You can hire a private investigator to follow her and catch her buying or using, but you still have to prove it affects the baby - either she does it with the baby in the car, or she passes out or acts crazy and can't care for the baby. Since you probably don't have specific times and locations, this could cost you quite a bit of money. But that is the proof you need.
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My suggestion is that you Marchman Act her. You go to the mental health division of the Court and tell them you want to file a Marchman Act. It requires you to file a Petition laying out the facts why you believe she is a danger to herself or others (ie. the child). Tell the Court what she has been doing. The Court will review the petition and if the facts alleged are sufficient they will enter an Order requiring her to be picked up by the Sheriff's office and taken to a facility for evaluation. If the evaluation determines that she needs help, then they will recommend treatment of some sort to the Court. A hearing is held where this evaluation
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