Who Poisoned 26-Year-Old Hannah Pettey?

In a medical mystery, someone was slowly poisoning 26-year-old mother Hannah Pettey. Pettey lost a lot of weight, ending up weighing just 84 pounds. She was finally hospitalized with acute respiratory failure and kept alive on a ventilator. She was then diagnosed with lead poisoning. CBS News correspondent Anne Marie Green is investigating the case for a "48 Hours" episode airing Saturday and spoke with Inside Edition's Alison Hall. Pettey made a full recovery, but the mystery remained: who poisoned her?