YOU SAID:
she was staring at the sea, her eyes wide open.
INTO JAPANESE
彼女は海を見つめていた、彼女の目は大きく開いていた。
BACK INTO ENGLISH
She was staring at the sea, her eyes wide open.
INTO JAPANESE
彼女は海を見つめていた、目を大きく開いた。
BACK INTO ENGLISH
She was staring at the sea, her eyes wide open.
That didn't even make that much sense in English.