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The story begins almost immediately with the inciting incident, a shell cutting into the character's knee. Their reaction to this when they return home seems exaggerated, perhaps meant to symbolize childishness (or maybe I'm reading into it too much). It's the kind of story you could find many interpretations of.
The mom's reaction to the cut. Even the character in question doesn't understand what she means, leaving room for the reader to take away multiple meanings. The shell can't be 'just a shell,' considering it was able to harm the character.
Once you read the story a few times over, a meaning becomes clear. But it's hard to tell what the author's exact intention is. If this was the goal, then it has been done well. But perhaps for a more specific conclusion, you could spend less of your word count on describing the main character at the beach getting cut by the seashell and more on the conversation with the mom.
This is a beautiful piece. it gives the sensation of mystique, like the author knows something you don't. The minimal description is very effective and sweet. There are very few issues. I would gladly read this as flash fiction or a longer story.
Other than some adjustments of wording, I think this piece is near perfect. Exactly what I would want out of flash fiction.