Advice on mother's problem...?

My mom is 40 years old. But she does not act like it at all. She smokes pot. I don't usually care about that, because it is a you can do it, just not around me kind of thing. But she spends ALL of her boyfriends money on her habit, plus I think she is onto cocaine. She drinks very heavily. SHE HAS A SEVEN YEAR OLD IN THE HOUSE.

Now, I am on my own and married. However, not only is the seven year old my half brother, but two weeks ago she was found with non-prescribed medication, she drank, and took her boyfriends work truck and wrecked it, almost killing the seven year old as well as one of her other side boyfriends. She resisted arrest and got pepper sprayed as well. All of her counts are: DUI, Child endangerment, Driving intoxicated with child in Vehicle, Resisting arrest and driving without a license.

I had enough when I was 17 and moved out, with her drama. However this new level is very serious. Her court date is coming up in two weeks, and my husband refferred the possiblity of recommended mental and drug rehabilitation to the judge by me, as the situation calls, I am the only one who can do it, besides her husband who is not responding to any of this. This may be my only chance to get her some real help. But I don't want more drama than neccesary, and I don't want to get to into the situation if it may be over my head. What should I do? I am almost 19, about to go into the military and trying to get my life started. What would you do????