Just doing a quick write of this cause it's pretty catchy and I wanted to learn it.

Capo 2

Chords used:
       G    A bar?   Em    C bar
e------3------5------0------8------|
B------3------5------0------8------|
G------4------5------0------9------|
D------5------5------2------10-----|
A------5------5------2------10-----|
E------3------5------0------8------|

At the beginning she pretty much plays with the lower 4 strings varying between plucking
the E and then ADG, ADG together or all 4 lower strings together.  She  also varies it
a bit in the chorus when she only plays the G for 2 measures and Em for 2 measures 
(instead of playing the A bar and C bar) other than that it's pretty much just strumming and
getting the timing right... hope this helps :]