Authorities say Kiely Rodni may have been kidnapped because her vehicle is also missing.
(CNN) --
Friends, family and authorities are scrambling to find 16-year-old Kiely Rodni after she went missing after attending a party at a campsite in Northern California.
Kiely was at the Prosser Family Campground Friday night and was last seen around 12:30 a.m. Saturday, the Placer County Sheriff's Office said.
"We are treating her disappearance as a kidnapping at this time because we have not been able to locate her vehicle," sheriff's spokeswoman Angela Musallam said.
Authorities say Kiely Rodni may have been kidnapped because her vehicle is also missing.
Agents are looking for Kiely's silver 2013 Honda CRV and say her phone has been out of order since the party.
Kiely is Caucasian, 1.70 meters tall and weighs about 53 kilograms.
She has blonde hair, hazel eyes, and a nose piercing.
Kiely was last seen wearing a black Dickies tank top and pants.
At least 100 other youths and young adults were at the party in a wooded area, authorities said.
Kiely's loved ones are wondering how no one saw the teen leave, CNN affiliate KCRA reported.
"I can't believe it. There had to have been a person ... there were people sitting in cars, there were people everywhere around this place," Kiely's friend Sammi Smith told KCRA.
The land is about 17 miles north of Lake Tahoe and 35 miles from Reno, Nevada.
Wanted missing teenager Kiely Rodni in California.
On Monday, the Placer County Sheriff's Office flew a search helicopter over the area.
"Despite numerous resources we have used, Kiely and her vehicle remain missing," the sheriff's office said.
"We are currently coordinating with the California Highway Patrol, Truckee Police, the FBI and the Nevada County Sheriff's Office as we continue the search for Kiely."
Kiely's mother, Lindsey Rodni-Nieman, said the wait has been exhausting.
"My head is all over the place and I'm terrified. Bad thoughts are very strong and hard to keep at bay," Rodni-Nieman told KCRA.
"But I try to keep hope, you know, that we'll find her, that she'll come home."
Kiely's friends and family have created a website, FindKiely.com, to help with the search.
And a GoFundMe account was also set up to fund a reward for information leading to Kiely's safe return.
missing teenager
