This is a very un-like Christine song, so it's a pretty good observation to note that Danny could have had something to do with it. In fact, she has used very brief lyrics to construct long songs in other places (I can think of "Brown Eyes" now), but the chord progression and the bridges are very unusual to her straigthforward pop songs. It is a very interesting composition, and I believe she could have been looking for something that would match better with Danny and Bob's material, without breaking the harmony of an album that features three singer/songwriters. Perhaps she used some elements of Danny's compositions but it is her song anyway. Or perhaps she got some help from Danny. In any case, you got me listening to that song again, and it's a pleasure.
Song of the moment - Purple Dancer