Hello and thank you for asking your question on just answer. My name isXXXXX will try to help.
Lucky bamboo can cause gastrointestinal signs including vomiting, diarrhea, and abdominal pain. I would think you would be seeing something by now. The signs should resolve in 24 -48 hours. There should not be any tong term side effects from ingestion.
1/4 an inch is not very much so hopefully you will not see any signs.
Is she vomits, or has diarrhea, withhold food until it stops. You can give water unless she is vomiting. If she is vomiting, then withhold water too.
Then once she is not vomiting, you can gradually reintroduce water.
Then you can offer her small amounts of a bland diet consisting of plain chicken and plain white rice.
You can also give her 1/4 of a pepcid ac tablet, every 12 hours, to settle her stomach.
I hope this helps.