YOU SAID:
She'll be comin round the corner when she comes
INTO JAPANESE
彼女が来ると彼女は角を曲がってくる
BACK INTO ENGLISH
She comes around the corner when she comes
INTO JAPANESE
彼女が来るとき彼女は角を曲がってくる
BACK INTO ENGLISH
She comes around the corner when she comes
That didn't even make that much sense in English.