Close / Erika Raskin.

Enhanced descriptions from Syndetics:

Single-mom Kik Marcheson is doing the best she can. But effort doesn't seem to count for much in the parenting department. Her oldest daughter, Doone, is swimming in the deep end of adolescence. Casey, the middle-child slash good-girl is fraying along the edges and Tess, an idiosyncratic kindergartner, has installed an imaginary playmate in the family abode. When Doone falls in with the wrong crowd, Dr. Price, the TV therapist offers to help. What could go awry? You'll laugh with the Marchesons as everything seems to be turning up, until one of the girls goes missing . . . "Crisply written. A pager turner of significance. This wise debut novel, Close, slices into 21st century motherhood on an Academic campus revealing expected and unexpected terrors and tenderness. Erika Raskin captures the thousands of small choices that can go tragically wrong on an ordinary day, the perils of making the private public, and the vulnerability that comes with loving a child. Her ability to portray a mother's love for three very different children is uncanny." -- Alice Randall The Wind Done Gone; and Pushkin and the Queen of Spades