Sure, she had her flaws and was likely to be immature given her age. But none of that changes the fact that they initially took her baby without any investigation. And they weren't going to even let her have a say in court. Even the worst mass murderer gets to defend himself and have his say in court.
MCFD gave her less rights than the worst of criminals would get. Just because some teenage moms have in the past shown themselves not to be good mothers, does NOT give them the right to assume that she is guilty without even the most basic of an investigation. Why did they have to constantly break the laws and guidelines just to get her baby? (Read part I if you missed some of the things they did.