As usual, what actually happened is unknowable, and what the jury must base their verdicts on is simply whether or not the State met it's burden of proof on each charge.
From that perspective, I'm betting the jury won't convict Skylar on either the murder or negligent homicide charges. The only evidence the State presented that the baby was born alive came from Skylar's "confession," and the odds are that one or more jurors believe her confession (such as it was) was coerced.
I don't believe it likely this jury will be OK with having her walk. Even if the jury isn't unanimous one way or another about whether the baby was stillborn or Skylar killed her accidentally or by not seeking help, I can imagine them reaching a consensus that it was Skylar's legal obligation to seek help, and that she should be held responsible for her failure to do so.
Although I feel a great deal of compassion for Skylar, believe the baby was stillborn, and understand why she didn't feel she could ask for her parents' help, I agree that she should have, and that she should be convicted on the child endangerment charge.