From Vanity Fair:
After spending two months helping the F.B.I. gather evidence against her former boss, Squillari, a 59-year-old mother of two from Staten Island, returned a call from V.F.’s Mark Seal, who had contacted her in connection with the eye-opening Madoff story he wrote in the magazine’s April issue. Seal and Squillari ended up collaborating on a first-person account of Squillari’s time with Madoff, whom she knew as well as anyone outside his family.
Interview with Bernie Madoff’s former Secretary here