Suspicious van may be key to finding Daniella.
On both occasions teenagers, mainly girls, were seen talking to the male driver of the blue, Transit-type van, according to mother-of-three Joanne Nyland, aged 32, a near neighbour of the Jones family.
Ms Nyland said she had noticed the van in February and at the end of May.
After police announced over a week ago that a witness had seen a girl matching Danielle's description getting into a dark blue van, Ms Nyland told an officer carrying out door-to-door inquiries of her suspicions.
Police said yesterday they were acting on her information.
The news came as it was announced officers are today to ask for the help of drivers and train commuters in finding missing schoolgirl Danielle - exactly two weeks after her disappearance.
A police spokeswoman said officers would hand out leaflets this morning to drivers and passengers at a East Tilbury train station.
The 15-year-old from the Essex village, was last seen at 8am on her way to catch the school bus on Monday, June 18.
Minutes later a girl fitting her description was seen getting into a dark blue Transit-type van, apparently 'without hesitation.'
Meanwhile searches continued yesterday of land near her home.
They involved specialist teams from the police force, fire and rescue service and civilian search organisations, and not members of the public, police said.
Police will talk to drivers along Princess Margaret Road, the major route through East Tilbury.
Danielle's school bus also travels along this road northwards to her school in Stanford le Hope.
The spokeswoman said: 'We are going to be handing out leaflets and not holding up drivers unless they have something to tell us.
'We also want to know where the blue van went.'
The leaflet will contain a photo of Danielle and ask the public if they know anything about the circumstances of her disappearance.