Granddaughter is a bit paranoid about spiders, usually screaming if one is seen anywhere near her. She was the first to spot this nursery web spider basking in the sun on a patio planter, and was quite intrigued to see the large white ball underneath, and larger than, its cephalothorax (see this wiki on spider anatomy). This white ball is an egg sac, bound in silk.
This spider was about 3/4 inch long. The identification is confirmed by the size, colour, stripe on the abdomen, sunbathing habit, egg sac and front pairs of legs together.
The female carries the eggs until they are almost ready to hatch and then spins them a silk tent.
Perhaps one day the interest will overcome the fear, and granddaughter will come to like those very useful spiders.