If a jury found her not guilty of murder, they were not convinced that she did it on purpose. I am unsure how it works at trial, but a jury may have the option to find her guilty of a lesser charge. If not, then she could be acquitted, like OJ and Casey Anthony were.
The state charged NV, they have evidence against her only; there would be no reason to continue to look for another suspect. She admitted to the baby being injured while in her care. She says it was an accident. The hospital said the fatal injury was intentional and abuse, so the prosecutor is charging her with murder.
It is one of the dangers of potential overcharging, IMO. The state will need to prove BARD to a jury that LK’s death was not accidental, was intentional, and that NV was the culprit. As mentioned by others, manslaughter and/or negligence might be the more accurate charges.
We will need to hear more at trial - if the case goes there. A plea could happen instead. Or charges might be dropped upon review of evidence. I don’t think that’s likely, though.
jmo