Since people don't fully understand the meaning behind this story, I will explain.
Before meeting the lil'vampire, the female protagonist always felt a constant, agonizing pain because of depression. She would self-harm to distract herself from the torment in her mind. Then lil'vam came into her life. The female protagonist gradually found joy and hope in living while caring for the child, and the inner pain began to diminish. As a result, self-harming no longer provided temporary relief from her soul's agony. Now, she purely feels the pain caused by the cuts on her hand.
The storytelling here is really good with that punchline at the end. "This isn't good. All I feel now is pain. It's lost all meaning.". This line tricks reader into think that the girl feel empty and more depressed after the lil'vam is now gone, but no, it's actually the opposite. She has hope now. What "lost all meaning" is the act of self-harm itself.