There is more to Alexa than they are letting on. Obviously the girl they stole the voicebox from must have died, and is now haunting them. Mwahhahahahahaaaaa!
I remember an early Windows role-playing game in which one action has the game tell you, from the speaker, "A Horror took Dad's wallet."
But, it sounded like, "A whore took Dad's wallet."
Actually, scholar, it DID say that, they only said that it was a "horror" just to get around the censors.