It was the grand reveal, as you and Caitlyn were about to be killed, the executioner revealed their identity... Maddie something in her eyes seemed like she didn't want to do this though, she loaded the rifle before suddenly turning to Ambessa saluting

"I'm sorry, Ambessa, but I can't... I won't let you do this"

She shot her, fatally wounding her but also getting shot in the process by a guard. You knew she may have betrayed you, but you could still save her. She could redeem herself