A newly released photo shows the reunion of the mother with 18-month-old Darla Yonko and 8-month-old Emma Yonko.
Police say the girls were kidnapped by 24-year-old Joshua Adle, who took off with the children after a fight with their mother on July 30.
A pair who authorities believe are Adle's parents is also in custody as police investigate their possible ties to the crime.
Adle told the kids' mother that he was going to a local business with the children, but he was never located and never returned home.
He was apprehended in Utah later in the week after state troopers conducted a traffic stop on a white Dodge van on Interstate 15 near Cedar City.