WE MISS YOU SO DESPERATELY.
Linda Jones, 41, broke down as she made an emotional appeal for anybody holding Danielle to let her go.
As the hunt entered its 16th day, a distraught Mrs Jones said: "Danielle, if you are reading this, we miss you so desperately. Just come home."
And to anybody who may have snatched her, she said: "Put an end to all this. We cannot carry on like this. It is tearing us apart."
Danielle, 15, vanished on June 18, after leaving her home in East Tilbury, Essex, to go to school.
Linda said she and husband Tony are living a nightmare and their two sons are missing their big sister.
She said: "We wake up every day and hope it's not real - but it is and we just have to get through as best we can."
Detective Inspector Peter Coltman, leading the search, said: "I think it is increasingly likely that Danielle was abducted. We hope desperately this turns out to be a case of a runaway with a happy ending.
"But without any sightings in over two-and-a-half weeks we are becoming more and more concerned something sinister has happened."
He added: "I want to hear from anybody who may have seen a young girl getting into any car in the area of Coronation Avenue. We must eliminate all possibilities."
A man arrested on suspicion of abducting Danielle was released on bail after being quizzed for three days.