Thanks guys - I rang the on call vet and she said to try to get her to take some cooking oil to try and make it pass through her. I tried adding some oil to her food but she wouldn't eat it, so I've been giving her "Defurrums" - they're designed to help them pass hairballs, so I figured it would work for this. So far, she hasn't passed it, but she's not in any pain or anything, so hopefully everything will be fine.
IT DEPENDS ON THE SIZE OF THE ELASTIC, MY 9 YEAR OLD LOVES ANYTHING ELASTIC, AND IT NORMALLY COMES UP AFTER SEVERAL HOURS, I TRY TO KEEP IT AWAY FROM HER, BUT SHE FINDS IT. SHE SHOULD BE FINE, BUT JUST KEEP AND EYE ON HER
is it a fine elastic?..or a thick band?