Child Swallow Wood

How big was it and was it sharp or rounded? A sharp or pointed object can puncture things and probably requires medical attention. Otherwise, it should pass and you will have to look for it. You may want to purchase some rubber gloves and Popsicle sticks.

I'm going to agree that you should take her to the ER. Wood can splinter, and if it was treated with any chemicals that could be toxic, that's bad to. Better safe than sorry.

I am a worry wort, I would already have been to the ER and had an X-ray taken to see if it was in a dangerous place or passing well.

At it's worst it can puncture stuff or rest in a place that things need to go through. On the other hand it may pass easily and not be a problem at all.

Call the Pediatrician, the doc on call is probably up and making rounds by now.

Take her to the ER. I'm not sure why a piece of wood would cause her pain while she's walking, but she should be seen by a doctor.

Take her to the ER or urgent care...

Finished? Painted? Unfinished? Smooth? Rough? How big?
If you haven't already gone to the ER, please do so ASAP.

After the docs have got it out of her, or after they have instructed you
on what to do to help get it out of her, depending on its size and description, please look into getting some family counseling.

An eight-year-old child KNOWS BETTER THAN to swallow a piece of wood.
It occurs to me that she might have done this intentionally for attention.
Eight is an age where a child can reason, can consider consequences.

Did she tell you about it only after 12 hours?
Did she tell you HOW (or why) it happened?

If you don't already have good communication between you,
you need to start working on that ASAP.
She's JUST heading into the age where you'll want her to trust you,
to know you're a safe reliable resource for her
as she goes through the upcoming changes.