I don't know if this is right, but I gave it a go anyway. I haven't worked out what 
chords she uses in the ohhhh aah's between verses. Help someone? :)On her live performances 
it looks as though she uses F and G minor bar chords so I'm fairly sure that is correct.

No Capo
Picking pattern:
----------------------------|
-----------------x----------|
--------x-------------------|
-----x---------x------------|
--x--------x----------------|
----------------------------|

Chords:
F 003211  or 133211
Gm 355333
C7 032310

F         Gm                 F       Gm
I fell in love with a boy in blue  oooh
F                                                   Gm
I don't know why, but I felt like I could fly when he was near
     F              Gm
This will not do   ooh

F          Gm                 F
I fell in love with hands on you
F
Slander sincere I shy I disappear
   Gm
Oh he is dear
      F
If he only knew


C7
Will he see what's becoming of me?
        F
I Am A petal.
C7
Will he please come and tend to me
        F      Gm       F
I am a willow weeping, willow

(Hhhhhhhhhhhhhhhooooooo)

 F      Gm              F
Do you think that I am pretty?
F
Sometimes I do sometimes I don't
Gm
Look at me
        F
Tell me honestly

Chorus

C7
Will he see what's becoming of me?
        F
I Am A petal.
C7
Will he please come and tend to me
        F      Gm       F
I am a willow weeping, willow

(Hhhhhhhhhhhhhhhooooooo)
(Hhhhhhhhhhhhoooooo)

Chorus
C7
Will he see what's becoming of me?
        F
I Am A petal.
C7
Will he please come and tend to me
        F      Gm       F
I am a willow weeping, willow

(Hhhhhhhhhhhhhhhooooooo)