LONDON - The Iron Lady is a mere shadow of her former self. Since the death of Denis, her husband of 52 years, on June 26, the physical and mental powers that Lady Margaret Thatcher wielded during her 11 years as Britain's prime minister have all but vanished. 'She has been abandoned and forgotten, with few close friends to share her old age,' according to TV producer Linda McDougall, who has known Mrs Thatcher, now 78, for 30 years.