Police say the attack happened around 3:15 p.m. Wednesday as 46-year-old Janice Watkins was leaving Pittsburgh King PreK-8.
Authorities say she was being followed by a couple in a SUV, and when she stopped at an intersection the woman threw a brick at her.
Police say the couple then pulled Watkins out of her car and continued to assault her. Watkins was hospitalized with facial injuries and a lost tooth.
Police say they were preparing arrest warrants for the couple late Wednesday.