I used to think that, but I've since decided that Darlie could be a danger not to society as a whole, but to her loved ones. Her basic personality has not changed. She's young and could still have children, and poor Drake is still there too. How can we be sure that all the "Darlie" reasons will not come back? I do believe that night everything came together, crashed on top of her and ended in the murders of her 2 boys, and that any other night it might not have happened. How do we know similar things won't push Darlie to the edge again? Unlikely, but she's still Darlie.
John List was not a danger to society in general. He only killed his family. However, one thing which triggered John's descent was money problems. Some years before he killed his family, he was in debt and he and his wife and kids just left town, dumped the house and the cars, etc. He showed a history of running from problems. He did fine when he was on the run, after the murders, because he worked at simple jobs and rented cheap apartments. Several years before he was caught, he remarried and began buying the things which we all "need", a house, cars, furniture. Then he started losing his jobs(accounting positions) and going under. Would he have done it again? He was caught before things got impossible. In a recent interview, he said how he enjoys his life in prison. He has a little job in the library and he doesn't have to worry about real life. So John's personality is still there. He still wouldn't be able to handle the real world.
Suppose Darlie played it cool when she got out of prison, but then before too long, starting spending money and taking trips and all the things she likes to do? TX doesn't have LWOP does it? If it does, that sentence would be the right one. Darlie should not be allowed out of prison.