Authorities say she was trapped as flames tore through her home in the 100 block of Mount Zion Avenue in North Coventry Township.
A police officer on foot patrol spotted the fire before 4:00 a.m. Tuesday and called for help.
Firefighters responded quickly.
It took them about half an hour to get the blaze under control. After dousing the flames, they found the victim inside.
Her name has not been released.
Investigators are working to determine what sparked the fire.