I got this tab from watching her video, so I hope it's right..

Standard tuning, capo on the 3rd fret.

E|3 - - - - - - - 8 - - - - - - - - - - - - - - - - - - - - - -|
A|- 2 - - - - - - - 7 - - 7 - - - 10- - - - - - - 5 - - - - - -|
D|- - 0 - - 0 - - - - 0 - - 0 - - - 9 - - - 9 - - - 4 - - - - -|
G|- - - - 0 - - - - - - - - - - - - - 0 - - - - - - - 0 - - - 0| 
B|- - - 0 - - - - - - - 8 - - - - - - - - 8 - - - - - - 0 3 3 -|
E|- - - - - - - - - - - - - - - - - - - 10- - - - - - - - - - -|

This repeats itself until she starts singing
"Ooh, but history has shown us that.." There she starts strumming:

E|3 3 - 8 8 - 0 0 - 0 0 
A|2 2 - 7 7 - 1010- 5 5
D|0 0 - 0 0 - 9 9 - 4 4
G|0 0 - 0 0 - 0 0 - 0 0
B|0 0 - 0 0 - 8 8 - 3 3
E|0 0 - 0 0 - 0 0 - 0 0

And after this she continues the first part. Listen to the song for the rhytm etc..
Hope it was helpful!