Unwoman - Is she secretly on my side

Is she secretly on my side?
Does she know all the reasons I've cried?
And secretly still sing along
The soundtrack of her life my songs
(She always got the meanings wrong)

She's my sororal doppelganger
Following close like a phantom
Loving my discards just to confuse me:
Which of us holds the hand-me-downs?
(Which of us wears the wedding gowns?)

Now she wears my old life, the life I think she made
On my competitive side she preyed
Did she always picture herself in my place
Now the darling's won the race
(I wish that she could see my face)

Does she remember the day we tried on white dresses
The day she was my sister, before I was her confessor
Now does she revel in victory
Or is she plagued by the ghost of me?
(Haunted by what she can not see)