Hello @ayin,
This story has many good elements. You create two sympathetic characters, Alice and Lizzy. You create a dynamic circumstance. Lizzy was abandoned by her father years before. The mother tries hard to give the child confidence, but there is trouble. Cancer is the final assault on this child's sense of well-being.

In the end, we have a father reappearing, but we don't know what he plans to do for his daughter. It might work better if you didn't write about the father's new family. This seems to complicate the story line.

Keep writing. Sometimes it helps to outline a story before you write and then the plot becomes clearer.

Thank you for sharing this story with us. We hope to read more from you in the future. We appreciate that you engage with other authors.