SILVER SPRING, MD. - A former Montgomery County Public Schools teacher is facing multiple charges after police say she entered a Silver Spring elementary school, assaulted staff members and triggered a lockdown. What we know According to Montgomery County police, 27-year-old Nadine Dogbo, a former teacher at Glen Haven Elementary School, entered the school around 11:30 a.m. Wednesday and allegedly assaulted several staff members before leaving the building.