DAYTONA BEACH, Fla. – A woman who was a teacher at a private Christian school and a foster parent in the area is accused of sexually abusing one of her former students, according to the Daytona Beach Police Department.Police said the victim’s mother contacted them late last month after she uncovered possible abuse involving her son and 31-year-old Kristen O’Brien, who had been the boy’s teacher at United Brethren in Christ Academy in Holly Hill about two years ago.The woman said her son ran away and when he returned, she looked through his Instagram messages to find out where he had been and saw messages between the boy and O’Brien, records show.[TRENDING: How to turn off Facebook election reminders | Big rig with police lights pulling over.