So often in our lives we regret the things we couldn't do, so we try to value the things we could.
In this snippet Jeanette Walls lists the things she wishes she could have gotten her little sister, and starts to talk about the things she could do.
I couldn't get her what she needed most—hot baths, a warm bed, steaming bowls of Cream of Wheat before school in the morning—but I tried to do little things.