What I hear you saying is that neither the mother nor the baby died, and that you think, and apparently they also, that money is so important it is worth killing another human being.
Many people come back from financial hardships, and many families grow stronger together while going through them. Your aunt (and uncle's?) inability to manage their finances is hardly a good reason to murder someone else.
No doubt, we are not getting the full story here, assuming it is true to begin with.
But, too bad she didn't have your cousin ripped limb from limb when she had the chance, right? Here's hoping your cousin doesn't give a damn about your opinion. Such evil- wishing that someone alive had been murdered for the sake of convenience.