Last edited Sat Jun 2, 2012, 12:38 AM - Edit history (1)
If she didn't eat a whole bunch of them she just might have some diarrhea or barf and that would be the end of it. If she ate a lot of them she probably barfed already that you haven't discovered yet... check the insides of your shoes.
Seriously though, I'd just watch her for a day or two to see how she's reacting. If she seems her normal self (eats her meals, plays, etc.) she's probably none the worse for wear in having indulged. But if she seems listless or in pain or doesn't have an appetite for her regular food or is still having diarrhea or barfing after a day goes by a call to the vet may be the best bet. Other than maybe getting an upset stomach for a few hours or a day she'll likely be ok.
To be on the safe side, too, you might want to check the ingredients on the box of cookies and then check the internet to see if there's anything in the cookies that might be toxic to cats. If it turns out that there is, you should probably call the vet and see if there's anything you should do.