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As hilarious as this is going to sound, it sounds as though she is bonded to you as this cooing sound is typical behavior in females trying to proposition other male cockatiels into copulation. I would discourage this behavior, don't interact with her while she is making that noise. Also avoid any type of petting that involves touching her back since this might be interpreted by the bird as a mating ritual encouraging more egg laying. It isn't uncommon for birds to get bonded to an owner in this way; it is pretty typical.
