In many ways, very well written. I'm sad that I've not read any of your work before.
Your use of structural nuance - internal rhyme and astronomical amounts of aptly applied alliteration

- serves to enhance the piece and maintain the reader's interest without ever becoming a distraction.
The way in which you paint the portrait of a life denied its past happiness immediately engages the reader, beginning with the first stanza:
All that which breathed life into her
Now riddles her broken heart with pain
As everything and nothing changed
As her dreams died in tears.Then, you proceed to decry the lack of drama in life, that one's tragedies are not even heralded by word or song, but rather that we sink into our own depression, unnoticed and unmissed. And then the last stanza:
Sweet melody farewell
Play on to the talented few
Who will understand your favored fickle tune.You leave the reader in doubt whether the subject has herself said "farewell" to the sweet melody that is life or if it is you, the author, who are turning your back on an existence that would permit such unjust tragedy. Either way, the reader is caught in the mournful notes that the Great Floutist plays for us all, and must pause and listen as the poem fades out of earshot.
Now, believe it or not, I have a critique, and one that I myself have before received - this poem, at times, runs the risk of being too wordy. I had to chew through your words as I proceeded, having to pause periodically to pry syllables from between my teeth. (I know that made no sense, but I like the analogy). Anyway, the point's the same - perhaps you sprinkle in a few monosyllabic words in place of your many three and four syllable words. This, I think, would help even out your flow and cause it to read more easily. Take a look, and see if you can do this without compromising the meaning of the poem, which is excellently portrayed.
Well done, over all.