Sometimes, it depends on your dogs metabolism...
OUr Huskies like to eat EVERYTHING they find.. wood, plastic, cotton, Tyr ate thread once...(that one was scary).
It usually passing their system within a week completely, but most often the next few days it comes out.
Do you know much of the frisbee shes eaten?
If you notice her going off her food, having problems going to the washroom or starting to throw up.. I'd bring her in for an Xray.