A lady meets her man for tea one day, only he's breaking up with her ("I'd like to be a friend").

Deeply hurt, she drives her car to his workplace and waits for him to come out. When he steps into the road she runs him down ("I saw the people crowding round / You didn't move or make a sound").

Realising what she has done, she flees the scene of the crime ("She's got to run / Run away from home").

I didn't make this interpretation of the song until recently, even though I've been listening to it for months. Perhaps this is because it is a fairly upbeat and jolly track. Funny how the meaning of song lyrics can be hidden behind the music.