YOU SAID:
She sells seashells by the sea shore
INTO JAPANESE
彼女は海岸で貝殻を売っています。
BACK INTO ENGLISH
She sells seashells on the beach.
INTO JAPANESE
彼女は浜辺で貝殻を売っています。
BACK INTO ENGLISH
She sells seashells on the beach.
That didn't even make that much sense in English.