Kitten ate plastic

Hey I'm new to this site but I need a bit of help my 6 month old kitten ate a corner of plastic packaging like you get over a card. Well I think she ate it because I saw her chewing it and then couldn't get it off her but I've checked around the house and I can't find it anywhere so I'm pretty sure she's eaten it. She seems fine but she has the vets tomorrow to get neutered but I'm still worried.
Thanks for your help.

if your kitten starts to look off ie vomiting, lethargic, particularly if she or he is straining to go to the loo get it to the vet immediately. Check its stool to see if it's passed through.

Thank you for replying but I found the bit of plastic that I thought she'd eaten [emoji]128522[/emoji]