Schiffmann is Control's assistant at The Pentagon.
She briefs Control regarding an imminent terrorist attack in Detroit thought to be orchestrated by Yasin Said and several associates. She is present alongside Control in the operations room as Grice and Brooks neutralize the suspected terrorists. (“Control-Alt-Delete”)
By Control's orders she indexed the numbers Control got from Shelly Spencer's memo with addresses and coordinates to look for a target, searching threat reports for tomorrow, May 6th. Suspiciously no target came up with D.C. for a moment but immediately fixed, watching Samaritan 'glitching' with Control. She personally hears from Control that the attack called 'the Correction' is imminent in May 6th, asked about any operations in or out of D.C., answers all quite except operational quarantine in Columbia Heights. Control asks who gave those quarantine orders, telling it was Control herself.
Later, she is killed via lethal injection by an agent because Samaritan identified her as disloyal and had her killed as part of the Correction. (“YHWH”)