Hi and welcome
Oh they can be little devils about spaying. I once knew a cat who arrived home bandaged (decades ago) and duly returned for stitches out ... no stitches. She'd sneaked her long Siamese nose under her bandage and removed them herself.
One of mine (also Siamese) blatantly took all but one of her stitches out within 24 hours. Panic! Back to the vet! Who said, don't worry unless it gapes. This again was a long time ago, and he reassured me that they stitched inside (dissolvables) as well as outside. She was fine, the little horror.
Has Catherine (Caterina? Catty? Love the name) had her stitches out yet? Judging by the presence of nipples I take it she's had what they call a midline spay rather than the conventional flank (looks less disfiguring; flanks take ages to grow back in.) The stitches could be irritating her, but also the shaving could; someone on here has a cat who licked rather a lot at the shaved area rather than the stitches. Anyone out there who's done body depilation may know what I mean (and I won't make any crude and vulgar jokes about pussies ... ooops I just did!

)
I'd be inclined to take off the cone under supervision and give her a bit of freedom, but keep a close eye on quite where she's nibbling or grooming and if the wound does gape (though it oughtn't to by now) or looks red/inflamed take her to the vet, but I reckon she's had time to heal.
Good luck with her and apologies for coarse humour and please keep us posted
