Thank you for the input.
The symptoms are unlikely from the piece of fork.
That small piece taken on Sunday should not cause problem.
it can be from infection, indigestion.
You can wait & watch now.
Please keep her hydrated.
You can give her pedialyte in sips to prevent dehydration.
If she develops pain, fever, distension of abdomen, I would advise to take her to ER.
Otherwise you can take her to doctor in the morning.
I hope this information will be helpful.
If you have any query, please feel free to ask.
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Wish her healthy life.