Tessa Hadley, from the 1/21/13 New Yorker
#6 in the I will read and take brief notes on 300 short stories series
The story of Laura, recently dumped by her husband, still young, housesitting for a more sophisticated older woman. There's an attic, a diary, pornography, and Laura reaching a space where she has almost none of her married possessions nor money. An encounter with one of her benefactor's lovers sends Laura on her way to independence and adulthood.