Sadie Grace Andrews was playing with her siblings around 1 p.m. when she fell into the pit outside Bruster's Real Ice Cream in Auburn.
"She had been absent around 5-10 minutes when she was discovered inert in the oil trap", the coroner said.
She was rushed to East Alabama Medical Center where she was pronounced dead in the emergency room.
Lee County Coroner Bill Harris said in a news release the death appears to be an accidental drowning.
"I'm just so thankful for the three years we had with her", Tracy Andrews, Sadie's father, told AL.com.
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Her mom, Corrie, said: 'Her name means God's thoughtful princess, and she really was that - always expressing gratefulness and love for God and other people.
That video reportedly shows Sadie stepping on the lid of the grease trap and falling through before the lid closed above her.
Sadie's parents said that she loved riding her bike, playing outside with her siblings, and hiking with the family at nearby Chewacla State Park.
Family members and employees of the ice cream shop immediately began CPR. The owners of the Auburn store wrote on Facebook they were familiar with the family and said they are "truly heartbroken that this happened". Our thoughts also are with our young crewmember who tried to revive the child.
The statement continued: "The entire Bruster's family is horribly saddened by this tragic accident". We continue to help local authorities investigate what caused this incredibly sad accident.