Police conducted a ground and aerial search Thursday in three counties for two women and a girl missing since May 29.
The search was fruitless, but, weather permitting, the aerial search will continue today, said Kym Koch, Oklahoma State Bureau of Investigation spokeswoman.
Jackie Taylor, mother of Wendy Camp, said Thursday she does not have much hope that her daughter, who suffers from multiple sclerosis, is still alive.
Missing with Camp, 23, are her Camp's daughter, Cynthia Britto, 6, and Camp's sister-in-law, Lisa Renee Kregear, 22.
OSBI agents, joined by Bristow police and Creek County sheriff's officers, searched Payne, Lincoln and Creek counties, Koch said.
Taylor said Wendy's doctor feared Wendy would be either dead or in a coma without her medication.
Wendy Camp, her daughter, and her sister-in-law went to Shamrock on May 29, Taylor said. She said Wendy called her husband about from the Shamrock Cafe about 5 p.m. that Friday.
That was the last time any of Wendy's family have heard from her, Taylor said.
Koch said the three were riding home with an acquaintance when they got into an argument with the driver.