43-year-old Madeline Hughes of Camden has been charged with criminal trespass.
Police say she was in the vacant home that caught fire just before 1:00 a.m. Friday in the 400 block of Chambers Avenue.
The blaze quickly went to two alarms as it spread to a neighboring home.
One house was gutted and another was damaged before crews got the upper hand.
One firefighter was treated for smoke inhalation.
Still no word what caused the fire.