People are saying went partying while her child was "missing" which is something mother's don't do. Usually a mother can't find her child she worries or spends a minute to look around rather than going out for a night of fun(this sort of plan also gets cancelled).
She could have just locked her in the house. Surely the child would have been able to survive for more than 24 hours on her own.
The point is she didn't do that, the trunk was more fitting. You are trying to apply logical thought to the mindset to someone who was accused of murdering their young daughter, not reporting it, and showing she didn't care. Whether she actually intentionally killed her kid or not she still has undeniable mental issue and can't be considered to rationalize this type of situation, and is guilty of child abuse and negligence even if the courts said otherwise.
Feel free to apply this kind of logic to most other case of murder/manslaughter, you will find that the person charged technically didn't have to kill the other person to get/do "xyz." (Unless they just wanted the person dead)
I don't see where the hell you are coming from. She is obviously a bad person, and should never ever be allowed to raise another child ever again. Whether she intentionally killed or allowed her daughter to die is up for question, but the woman was an asshole and deserves every bit of criticism these meanies on the internet throw at her skank ass.