YOU SAID:
she eats sea shells by the sea shore
INTO JAPANESE
彼女は海岸で貝殻を食べる
BACK INTO ENGLISH
She eats seashells on the beach
INTO JAPANESE
彼女はビーチで貝殻を食べる
BACK INTO ENGLISH
She eats seashells on the beach
That didn't even make that much sense in English.