Aug. 5
Surveillance footage captures Kiely at a local business on Aug. 5 wearing a black bodysuit and Dickies pants roughly six hours before her disappearance.
Later that day, Kiely, an early high school graduate, attends an end-of-the-summer party with friends from high school near the Prosser Family Campground. Locals call the area "the campground."
The party escalates from a high-school event to a party of some 300 people ranging in age from teenagers to young adults and even some older adults, some of whom the teenage attendees were not familiar with. The party included drugs and alcohol, and officials are searching for video footage or photos of a possible fight that occurred that night.
Kiely's friend, Sami Smith, who was at the party with her, said that Kiely was planning to spend the night at the campground.
"I know that she wasn’t in the right mindset or state to drive. And if she were to have driven, she wouldn’t have made it far," Smith told a local news outlet.
Kiely texts her mother around 11:30 p.m. saying she is planning on leaving the campground around 12:15 a.m.
"I asked her to be safe," Kiely's mother, Lindsey Nieman-Rodni, told Fox News in an interview Friday, " … and that was the last time she texted me."
Aug. 6
Kiely speaks with friends and family shortly after midnight, according to authorities.
Her phone turns off around 12:33 a.m. that morning. It last pinged near the Prosser family Campground within Tahoe National Forest before it turns off, Placer County Officials said.
The 16-year-old's family lives about 10 miles away from the campground at a lodge south of town.
Kiely is reported missing, and the Placer County Sheriff's Office shares a notice regarding her disappearance later that day. The Sheriff's Office also reported that Kiely's vehicle, a 2013 silver Honda CRV with the with California license plate "8YUR127," is missing.
Aug. 7
The Placer County Sheriff's Office establishes a tip line for information leading to Kiely's whereabouts.
Officials also begin a massive search for the missing 16-year-old near the Prosser Family Campground. The Placer County Sheriff’s Office says they are investigating a possible abduction because the girl’s SUV was also unaccounted for.
The sheriff's office did later clarify that they are investigating the teen's disappearance as a missing person case.
Additional timeline details about search and investigation at link.