I would be all for giving Misty some kind of chance in life if in fact she did not harm Haleigh herself. (Sorry, but I need to give priority to the little one over Misty if indeed Haleigh suffered at Misty's hand.)
If Misty got drug court or probation on the drug charges, went through rehab and got her life on track, could she stay that way? I seriously doubt it. If she were back with her parents, no way would she succeed. If she went with other relatives, likely the same thing. Friends? All seem to be into drugs.
She's too old for a foster home per se, but I wonder if Florida has adult foster care. Usually that is for physically or mentally disabled persons but if Misty really is a person of diminished capacity she might qualify for placement.
I cannot see Misty succeeding out on her own. She would have to have some type of supervision and likely for quite some time. I do believe it would be possible, but all would depend on her ability to conform and the state's ability to provide the necessary resources. She could get a job but that would likely pay for room and board only; it would not touch mental health and other services she would require.
I see Misty failing on the outside, eventually. I see her getting back into drugs and ending up in prison or dead. That's just my opinion, given her defiance and her "I'm not gonna do..." attitude.
That said, it would be nice if she could be given the chance to try. If she fails, she fails, and so be it.
As for Fields, I agree he probably should step down. I do not see much defense for Misty that could not be provided by another attorney. In Fields' defense, though, I think he tried. Misty did what she wanted to do, much of it against his advice. She even wanted to fire him to work with LP. And look how hard it is to keep Misty from talking/spewing/writing, etc., even from jail? Fields would have needed to hire guards to keep her in tow when she was free. I believe he tried, but there is only so much a person can do with someone who runs unbridled through life.