Firefighters had to battle through the smoke and flames to pull the trapped victim from the house.
She was pronounced dead at the hospital.
The fire was declared under control at 11:15.
Firefighters say there was one working smoke alarm on the first floor, but the woman was on the sceond floor.
Investigators say there is still no cause known, but there is evidence that the gas services were bypassed at the home, indicating there may have been an illegal utiltiy hook up with PGW.
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