Hernia from spaying question

Hi all

When I first brought Cassie home a year ago, she had a nice sized lump that was soft and moveable on her belly. The vet said it was hernia or scar tissue from spaying and should go away.

I don't think it was a hernia since it wasn't visible. It was just a lump under the tummy.. hernia you can see, right?

It's still there. not as big, maybe half the size, but still there. I was wondering if it would ever go away or if its something I should keep an eye on?

Hernias don't have to be visible, but I'm trying to think how she would have one on her belly.  And scar tissue is normally hard-ish.

I doubt it's a major worry, but I'm sure you'll keep an eye on it - noticing, in particular if it gets bigger or changes in other ways.