Halfman said search organizers had people call and volunteer to search from planes and by quad vehicles in the desert. They also searched locations in East and South counties, she said.
Halfman said they expected to have a good number of volunteers because of the holiday.
"Even if people have a few hours, (they) could come by and help," Halfman said. "No amount of time is too little." She said even if they can just pick up fliers and sign a card offering support, they can make a difference.
Halfman retired from the San Diego Police Department after she was injured. She worked mainly in patrol for 10 years, she said.
She said Brenda van Dam asked her to take over as the center director due to her experience in law enforcement.
Halfman said she had been at the van Dams' home since the beginning helping out and explaining to them about police investigative procedure.
"I personally know the investigators working on this case and they couldn't be in better hands," Halfman said.
Halfman said she tries to explain to them about methodical procedure and about how there is a lot of behind-the-scenes work that police cannot talk about to the media.
After some consideration of her own family and time, she accepted the responsibility as director. "I look at it as, if I had my own daughter missing, Brenda would be out there helping," she said.
Halfman, who is also a family friend of the van Dams, said Westerfield's arrest and Danielle's parents vow to keep looking for their daughter has motivated more people to search for the missing child.
"Everyone has caught on the energy of Brenda and Damon," she said.
Halfman said she and Danielle's parents are hopeful that police may receive information about Danielle's whereabouts now that there has been an arrest.
"There is the hope that now that (Westerfield) is in custody, he will say something," she said. "I think it is a matter of time before we find her."
Damon van Dam and his high school friend, she said, plan to search Borrego Springs today. Searches in East County will continue throughout the weekend, she said.
So far, the volunteers have raised $8,000 and spent $2,000 searching for the little girl, Halfman said.
Donations can be made to the Danielle van Dam Search Fund at any Wells Fargo bank.
Some have criticized the van Dams for their involvement in the Jahi search, but Diane Halfman, former director of the Danielle Search Center, said the couple probably would have been criticized if they hadn't helped.
Danielle's parents, Damon and Brenda van Dam, conducted a media conference Thursday to announce that the volunteer search effort, located at what is now called the Danielle Recovery Center at the Doubletree Golf Resort at 14455 Penasquitos Drive, would move Monday to the ReMax Building at Pomerado and Poway roads and would be under new leadership.
The center was originally led by the Texas-based Laura Recovery Center Foundation, but its leaders have trained local volunteers so they can take over, officials said. Retired policewoman Diane Halfman, a friend of the van Dams, will direct the center.