The intro part is very simple. It's just this:

C5  E5  G5  D5

This pattern is continued when she starts singing.


 C5                                           E5   G5   D5
I'm always swimming against the flow of the tide.

Kissing the life into something that's already died.

 B5       D5
I've been driving forever,
 B5       E5
I'll let go.
 B5     D5                    C5    E5
i dive into the river, and flow. 

Then it's the same the rest of the song.