Lucy(my cat) is behave grotesque! she's approaching sniffing the floor, later rolling around and is person moderately?
aggressive if I try to comfort her, deffo not fleas!
More predictable though is that there's a patch of smell she likes there. There's a patch of carpet which adjectives of my cats have loved (and do fostering, so have had frequent!). They will stand by it, then appear to drop on one front leg and roll their shoulder on it whilst purring and going nuts.
If that's what it sounds like, I wouldn't worry. With mine, (since preceding owner of house had cats) either catnip or urine is on that spot.
If it's worrying you though, I'd always call on a good vet.
Have you spilt something there? Carling probably? lol
Or it could be she's in pain somewhere?
EDIT: If the surgery was perform by somone less than competent then it is possible they left portion of an ovary behind, we've seen that a couple of times at work, but I doubt it.
She may be in HEAT... TAKE HER RIGHT AWAY AND HAVE HER SPAYED! next will be yowling!
Just let her go beside her hormones. When she does imerge from her 'nest', she might be little cranky for a few weeks. But she'll soon settle back to her old self.