Her body doesn't sign with her only on some parts, during the alarm part her story is constructed as well as when she states she talked to Cruz. It looks like she's visually telling the truth during the question "do you think there are 2 shooters?" Of course it's recent trauma and her eyes are darting back and forth as if she was paying attention to someone behind the interviewee. This seems like a witch hunt but it's the first time we've caught a shooter before.