The Bizarre Case of Jamie Stickle

First 5 minutes I go over the recent case of Casey Johnston - she was missing since July 10th and was found deceased by Philadelphia/Bucks county Route 1  - her car in weeds her body about a half mile away.
Tonight's case is about 33 year old Jamie Stickle - she moved from Uniontown to Pittsburgh PA to be with her girlfriend - a week after their tumultuous breakup Jamie would go out for a night after locking up the bar she managed and she would get good and loaded - so much so that the one bar she tried to get into refused her entry because they said she was too intoxicated. - she would also get into some sort of an argument before she left.
then her boss saw her about 245 am -outside of that bar trying to get out of a tight spot he guided her out said goodnight and she would drive home.
347 am the fire dept was alerted of a burning vehicle. The fire was so bad the firefighters would not realize there was someone in the drivers seat of that car until they had the fire under control. That person was Jamie Stickle.
What happened? Who killed Jamie Stickle? Or was it a bizarre tragic accident?