If she ate it then she needs to be seen. If she was just being obnoxious then chewed it up because it was fun then she should be okay.
The little slivers if plastic (most are not rubber unless its soft handled) get in her tummy and intestines it can cause a lot of sharp pain as these will be sharp little pieces passing inch by inch through the digestive tract, the vet may advise a home remedy, not sure what could be used as a binder so it doesn't cut her from the inside out. Call the clinic, yes they are closed but there's should be an in call vet to advise you weather to take her in or wait it out or they may open the clinic to see you, depends where you live.
We on Y.A. are not medically trained unless someone states they are a vet or a tech etc) nor can we give medical advice. Phone calls don't take as much time as just running to the E.R. vet, and if they are the only ones available, call first and ask what they think.
Good luck, hope things come out okay.