What is a short summary of the story, Mama, from the collection, Trash: Stories?

In the story, Mama, Alma, the narrator, discusses her great love for her mother. Alma recounts her stepfather’s abuse; if Alma wanted to spend time caring for her mother, she had to meet her stepfather’s needs, too. In the story’s present, Mama has been diagnosed with cancer, and the prognosis is not good. Alma cannot believe such a strong woman will be struck down. In the end, Alma recognizes how alike she is to her mother, although she is not quite as powerful and takes better care of her own body. Even though they are alike, though, Alma recognizes that she cannot rescue her mother from her life or her disease.