What is a short summary of the story, Volunteers Are Shining Stars, from the collection, You Think It, I’ll Say It?

In the story, “Volunteers Are Shining Stars,” narrator Frances works as a volunteer babysitting children at a homeless shelter called New Day House. Frances has obsessive-compulsive disorder, which causes her to wash her hands with extreme frequency and avoid human contact as much as possible. She does not grasp the severity of her problem. When a new volunteer, Alaina, arrives at New Day, Frances develops an immediate dislike for her, which slowly escalates over the course of the story, and is exacerbated by Alaina's good-intentioned mention of Frances' OCD. At the end of the story, Frances' misplaced rage boils over and she attempts to strangle Alaina. Another volunteer pulls the two women apart, and Frances never returns to New Day.