Investigators say she allegedly assaulted two staff members. A former Montgomery County Public Schools teacher accused of sparking a lockdown at a Silver Spring elementary school is expected in court Monday morning. Prosecutors say Nadine Dogbo trespassed inside Glen Haven Elementary School in June, assaulted staff members and then ran from police before she was arrested. Police say Dogbo, a former Glen Haven teacher, entered the school without authorization just before 11:35 a.m. on June 17. Image 1 of 3 ▼ Former Glen Haven Elementary teacher faces trial in assault case that sparked lockdown