In the novel, Eponine is referred to as a "rose in misery." I think that is a good characterization of Eponine. Had the situation been different, who knows what her life would have been like? Poverty had changed what had been a pretty little girl into an undernourished, sickly young woman about whom only the traces of beauty lurked. She loved Marius with a selfish love, the only kind she knew. And when she died, she felt at peace, because she was being released from her misery.
The picture above is of Lea Salonga, and if you click on it you will hear her sing "On My Own" from the TAC recording.
The skies begin to clear, and I'm at rest. (Characters)