My cat ate a balloon neck. Should I worry or take her to the vet?

Hello. Pancakes should be able to pass this as it is pretty small & pliable. If it has been more than a few hours since she ate the balloon, it is possible it has already passed out of the stomach into the intestines. I have seen cases where kitties have vomited up strange things a week later. Just watch her over the next 5-7 days for a loss of appetite, lethargy, diarrhea, & protrusion of the third eyelids. These are the tissues in the inner corner of each eye & when you can see them covering at least half the eyes, it is a clear indication that Pancakes does not feel well. If she is still her spunky, adventurous self a week from now, all should be well. Just monitor her for anything concerning. Thanks for using Petco Pet Education Center, formerly Petcoach.