A woman who was badly burned in the backyard of her Northampton home over the weekend has died from her injuries.  Officials say 50-year old Jennifer Driver-Nelson apparently was wearing a bathrobe that caught fire from a backyard pit that was burning.  She was rushed to a Boston hospital for specialized treatment of severe burns, but she did not survive.  Officials do not believe there is anything suspicious about Driver-Nelson's death, but they continue to investigate.