Why is my cat's stomach hard and swollen near spay site, but fine?

Hello there! There are a couple of things that come to mind with a hardened area at the spay site. The first and most common issue I can think of may be inflammation from a localized suture reaction at the incision site. When Soy was spayed, the vet most likely used a layer of absorbable stitches in her abdominal muscles below the skin. These stitches are meant to absorb over time (anywhere from 90-220 days, depending on the type of suture) and don't usually cause any problem, but sometimes the body's immune system reacts against this foreign material and causes swelling. This is not usually a medical concern unless the swelling is hot, red, or appears to be bothering Soy. If you see any of these symptoms, you should bring her to the vet as this may indicate an infection. It may take many weeks to go away - if you are at all concerned about Soy's well-being, feel free to give the vet that spayed her a call. If Soy will let you, placing a warm compress against the area for 10 minutes a day can also help reduce the swelling. There is also the possibility that this lump is a cyst or tumor, but this is much less likely considering Soy's young age. Good luck, and I hope Soy's lump goes away soon!