DAYTON, Ohio (AP) -- A lawyer says mediation has been unsuccessful between a California woman trying to adopt a toddler and the girl's biological father from Ohio who is trying to stop the adoption.

Richard Hempfling says his client, Stacey Doss, has been in Dayton for mediation involving 2-year-old Vanessa.

Montgomery County Juvenile Court Judge Nick Kuntz on Friday urged further negotiations and rescheduled a custody hearing for December.

Doss, of Rancho Santa Margarita, Calif., in July was granted an emergency block of a court order that required the girl to be sent back to Ohio.

Biological father Benjamin Mills Jr., of Dayton, filed for custody in Ohio in 2008 before the adoption was finalized. A spokeswoman for his attorneys at Legal Aid of Western Ohio declined comment.

The girl's birth mother supports Doss.