The whole song is just G, D, F, C.  Sounds best if you do the G as a bar chord.

G              D                F                C
I need you to pin me down just for one frozen moment. 

G                  D             F                C
I need someone to pin me down so I can live in torment.  Etc.


Even the chorus is the same chords. Couldn't be simpler. She's a genius.