Found out why Charlotte was so busy this morning. She was making the fancy white design in her web. She was at rest this afternoon, so I managed to get a clearer picture. Since my earlier post, I have discovered this is an argiope spider, also known as an orb weaver and also known as a writing spider due to the designs they make in their web as you can see in this photo.
The designs provide stability to the web and even though it reduces their "catch" percentage, it also reduces the tendency of birds to fly into the web.
Pretty, isn't she?