Join Date: May 2008
Location: St. Albert, AB, Canada
She isn't being maternal, OR 'hunting' the baby.
The loud noise is startling her and making her anxious. One of our four HATES loud noises and will growl and hiss at alarm clocks, phones that ring in the middle of the night, thunder (particularly funny), ambulances, loud music, ect. For her she's simply expressing how much loud noise makes her uncomfortable.
I'd be willing to bet your kitty is doing the same. To help her get over it a bit use a soothing voice and tell the kitty it'll be ok, as you comfort your child. I'd even give kitty a few treats when she's clearly concerned or upset about the loudness. This way she'll start thinking about the screaming as less negative. I don't think you'll ever get her to like it, since cats have much more sensitive hearing than we do, but getting her to accept it is a good goal.