Well, you probably need to tell Cook so he can tell her. Her compliant is that it sounds to her like Streizand instead of Streisand. Maybe it is repeating what it hears coming through her nose.
I've listened to Siri say Streisand four times, and I don't hear a "Z" sound. I think what you have here is a narcissistic Liberal demanding something be changed that only she can hear and Cook agreeing to change it to make her Zhut up.