Wii, did you know Who Moi also designs interior spaces? He's really good at it and was helping Twinkletoes with ideas on building wheelchair accessible housing. How cool is that? You both have something in common.

Ok, back to your situation. I don't have any advice except to maybe try and talk to your neighbor. I wouldn't start calling 911 without trying to get to know her first. Know for sure that she doesn't have an illness causing her screaming. If I called 911 on someone only to find they were sick, I'd feel just awful. The scariest part is what if the one time she screams, she really needs help, and no one calls because they are used to it? Scary.