yes that its normal, i use to work at a vet and people would call after a dog or kitty spay with that same question. it is soo normal dont worry, in time it will go away. she has stitches inside too, to stitch her muscles inside back together. So, the swelling is from those stitches being irritated & a little swollen. you can hold a cloth soaked in warm/hot water against her belly for about 10 minutes twice a day. This would help reduce the irritation. The swelling will go down just a couple days after that.
