So the mother was essentially held hostage by her daughter for a day in order to buy her a car. The mother the next day calls the police and her daughter is arrested. I do not get the bad parenting part of this concerning this situation.
First off I imagine it would be really difficult to turn in your kid no matter what they did. Secondly, she turned her in quite quickly. I mean this is an honors student who was allegedly accepted to Ivy League schools, and as far as we know had no negative fucked up history before this incident. That would be hard for any parent even if they were a victim of their child to destroy all of that.
They would be destroying their daughters life, their reputation in the community, and potentially their relationship with their child. I am not a parent, but I would imagine that this would be a very hard thing to do. And it took her 24 hours to make the right decision, so I say give this particular parent the benefit of the doubt without knowing all the details.