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Evelyn Boswell of East Tennessee was last seen in December but authorities issued an Amber Alert for her Wednesday.
Her mother, Megan Boswell, said she left her daughter with someone she trusted to keep an eye on her while she was at work.
She declined to provide any names.
Investigators arrested a man and a woman Friday and held them on charges unrelated to her disappearance, the Tennessee Bureau of Investigation said.
Angela Boswell, 42, -- the baby's grandmother -- and William McCloud, 33, were found traveling in a gray 2007 BMW and arrested in Wilkes County, North Carolina. Tennessee authorities had said they were looking for the vehicle and believed its occupants would have information about the toddler's whereabouts.
The connection to the car
Megan Boswell was in the process of buying the BMW in question for her mother, Angela Boswell, the Sullivan County Sheriff's Office said in a statement.
A purchase agreement was never completed, and no money was exchanged for the vehicle.
The owner of the BMW was unable to contact Megan or Angela Boswell, and the car was reported stolen, the sheriff's office said.
Angela Boswell and McCloud are both Tennessee residents. They are being held in the Wilkes County Jail, each charged with theft over $2,500, according to the sheriff's office. Angela Boswell is also being held on a violation of probation warrant for theft.
It's unclear whether they have attorneys.
Both are awaiting extradition hearings before being transported to Sullivan County in Tennessee. They're scheduled to appear in court Monday.
Conflicting statements complicating investigation
Investigators said Evelyn's mother is cooperating, but has given conflicting statements.
"During the investigation, authorities have received a number of conflicting statements. That, combined with the fact that Evelyn was not immediately reported missing, makes this a complicated case," the Tennessee Bureau of Investigation said.
The investigation began after a referral from the Tennessee Department of Children Services, Sullivan County Sheriff Jeff Cassidy said. The referral came after the baby's grandfather reported her missing.
The Tennessee Bureau of Investigation initially said the child hadn't been seen since December 26. But Cassidy said he believed Evelyn hadn't been seen since December 10 or 11, when a babysitter last reported seeing the child.
Evelyn's mother lives in Sullivan County and has sole custody, while her father is an active-duty military serviceman stationed in Louisiana, officials said.
Evelyn has blonde hair and blue eyes. She's 2 feet tall and weighs about 28 pounds.
CNN's Alta Spells and Jamiel Lynch contributed to this report.