I could not find the chords on any sites, so I watched a few videos of her playing this and this is what I 
got. First time sharing chords, but I think this is correct and I will tell you some of the tricks she does.
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It's Gonna Rain
Amy Cook
Featuring Robert Plant
Capo 2nd fret (Chords played as if 2nd fret is open)
(Chords shown at the bottom)

            G
It's Gonna Rain
                Em
Oh, it's gonna come down hard
                          C                     D
There will be flashes of light coming from the sky
                G
Shining in the dark
                G                    Em
Oh, It's gonna poor and fill up your cup
                         C                  G* 
And when it gets to the top it's not gonna stop
                    G
It will flow you a river

                 C               G
Oh, it's gonna bring fields of roses
                     Em                       C
You won't go until you've had more then your fill
                 G*
More wins then losses

            G
It's gonna rain
                 Em
It's gonna get colder
                C                       D                   G
It used to be said," It's not quite as bad now that we're older"

                    C               G
Oh, it just might bring fields of roses
                     Em                       C
You won't go until you've had more then your fill
                 G*
More wins then losses

             G
It's gonna start
                          Em
Yeah it's gonna get real quiet
                    C                    D
And A bird on it's way to some far off place
                         G
It's gonna sing you to sleep tight

                    C               G
Oh, it just might bring fields of roses
                     Em                       C
You won't go until you've had more then your fill
                 G*
More wins then losses

                    C               G
Oh, it just might bring fields of roses
                     Em                       C
You won't go until you've had more then your fill
                 G*
More wins then losses





G= E|--3---|
   B|--3---|
   G|--0---|
   D|--0---|
   A|--2---|
   E|--3---|

G*= E|------|
    B|--3---|
    G|--4---|
    D|--5---|
    A|------|
    E|------|

Em= E|--0---|
    B|--0---|
    G|--0---|
    D|--2---|
    A|--2---|
    E|--0---|

C= E|--0---|
   B|--1---|
   G|--0---|   She plays around with hammering on a pulling off on the d string
   D|--2---|
   A|--3---|
   E|--0---|

D= E|--2---|
   B|--3---|
   G|--2---|
   D|--0---|
   A|--0---|
   E|--0---|

She also does a little riff when going from G to Em
E|--3--3--3--0--|
B|--0--0--0--0--|
G|--0--0--0--0--|
D|--0--0--0--2--|
A|--2--0--0--2--|
E|--3--3--2--0--|


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Hope this was somewhat helpful.