"I'll love the time we had with her forever," said Marilyn Keil, Romero's adoptive mother.
They said they were at home when they learned two people were arrested and charged with her kidnapping and murder.
Romero's body has not been found and her adoptive father Richard Keil said they were "wishing (police) would find her one way or another."
"It's hard to hear on the radio that she's been murdered when we haven't really heard that from anyone else and it is hard to kind of believe that when we don't have a body. You know, how do you know?" asked Marilyn Keil.