Analysis of She Calls Me Sister

I knew her as my sister,
I thought she was my friend,
thanks to her,
she puts this story to an end.

Like a fairy tale of what my sister
 was to me?...
Now she taught me of a sister
  who just wasn't meant to be.

She betrayed me in our past,
I had closed the door,
                  but that didn't last.

There came a day I forgave her,
   for our mothers sake,
   the whole time,
   she was merely
                        just a fake.

Looking back,...& looking now,
I can hear her call me sister,
            & I really don't see how.

Leaving many of scars & a memory of shame...
She calls me sister,
I call her by her name....