What is the main conflict in the novel, The Good Mother?

The Good Mother is a book about a woman, Anna Dunlap, torn between her role as a mother to four-year-old Molly and her emerging role as a lover to the exciting artist Leo Cutter, whom she meets at a laundromat one day not long after her divorce from the staid and frigid Brian. The balance between these roles that Anna negotiates is ultimately an unstable one, and the unconventional world which attracts her to Leo eventually clashes with the conventions of her lawyer ex-husband, resulting in Anna's loss of custody over her daughter.