She stumbled on a plank, it made her think of something, she ran to show Noah... and then what? What about the plank?
I think something got lost from the web novel. Did it relate to the thing her brother was upset about?
In case anyone is curious how light utensils were made in the actual Medieval period, they fashioned them out of horn. Horn is the "Medieval plastic", because you can heat it and reform it to a degree.