YOU SAID:
She's rereading the letters you wrote her.
INTO JAPANESE
彼女は彼女を書いた手紙を再読です。
BACK INTO ENGLISH
She wrote her letter to reread.
INTO JAPANESE
彼女は再読に彼女の手紙を書いた。
BACK INTO ENGLISH
She wrote her letter to reread.
You've done this before, haven't you.