I have to admit that this poem is a bit long, but it didn't keep me from reading because one I started you had me captivated, your words kept pulling me in more and more and I wanted to know how the story developes. You managed to portray a vivid image because your words are really descriptive.
I also like the idea of the dress being white, since white is the color of innocence, but that it changes because of how people around her treat her (for example her mother). You mention the dress later on when her sister finds her too, which shows that you're not only refering to the dress itself, but also the message behind it.

[Leaves fall from autumn trees,
Landing around the tombstone,
The only one that rests,
On that hilltop,
Deep within the woods.]

^ I really loved this stanza, it was my most favorite actually because it's so vivid, I just like it I guess. Probably because I really like autumn too.

Overall I think this is a well written poem, that flows well and tells a captivating story.

I'd absolutely sign your note under the poem by the way.

This peice is amazing. You are very talented. The story pulled me right in and captivated me. Very descriptive your words took me to that place. This is going on my favorites. I would put authors note before your statement at the end just to seperate it from the poem. It took me a minute to realize that it wasnt part of your work.