YOU SAID:

if my car's out in the morning, she's done me in

INTO JAPANESE

私の車が朝に出ていたら、彼女は私をやってくれました

BACK INTO ENGLISH

If my car was out in the morning, she would do me

INTO JAPANESE

私の車が朝に出ていたら、彼女は私をやるだろう

BACK INTO ENGLISH

If my car was out in the morning, she would do me