What does "With her arms out like an angel through the car sunroof" mean in Good Luck, Babe?

I'm trying to translate this song to my language, but I can't seem to finish it because this specific line trips me up. Is it just supposed to be an imagery of the woman enjoying her time together with the singer? Or does it have a deeper meaning? And how does it relate to the previous line "Guess I'm the fool"? Like, how does the woman having her arms out like an angel make her a fool?