Urgent phone calls of concern, anxiety over the safety of her children, a rescued puppy that sparked her husband’s allergies — these are some of the components of the new book “A Mother’s Essays from Ground Zero,” by New York journalist Wickham Boyle. Profits from the sale of the slim volume will be donated to three of the schools located near the World Trade Center site. On the morning of Sept. 11, Boyle, who lives and works in a loft in the downtown neighborhood of TriBeCa with her husband and two teenage children, was an eyewitness to the attack. Her son’s school was only a few blocks from where the Twin Towers stood. The book, says Boyle in the preface, “began as a single essay and developed, inexorably, over a one-month period . . . it consists of the musings of a mom — me — as I tried to figure out each day after Sept. 11.” Ultimately, says Boyle, “it’s about the heroes of the catastrophe: all of the people who put one foot in front of the other, who moved mountains, who quietly wept or simply questioned the universe about why.” And already Boyle is seeing a groundswell of community support for her book. Not only is “A Mother’s Essays” available from the usual suspects — bookstores — but also at Bubby’s Cafe, a popular TriBeCa hangout where even uptown Jerry Seinfeld likes to go for brunch.