This article has a tiny bit more info:
"Sheridan Wahl...was dropped off at a fire station before her death due to “erratic” behavior, according to Florence County Coroner Keith von Lutcken.
"Wahl, 21, was dropped off at the Hannah-Salem Friendfield Fire Department along Highway 378 by a man who picked her up near Keith Lane,
where her crashed car was found burned. Lutcken couldn’t go into detail about what the behavior was, but told News13 investigators tracked down a witness who told them that.
...
"He also said there were only minor signs of external injuries and
most of the injuries were internal due to a fall."
Perhaps the person who picked her up saw the car crash site/fire and called the fire dept (hence the very quick discovery of the car). Maybe she was acting "erratic" because she had a head injury from the crash, so the person dropped her off at the fire station? You'd think this person wouldn't have just left her alone at the station, though. So I'm guessing she was left with a fire station employee and someone dropped the ball and at some point she was left alone, at which point she climbed up that tower and somehow fell.
Maybe that's why they are being so vague with the info -- they don't want to thrust any responsibility/guilt upon a fire station employee/firefighter.