ATHENS, Greece — As the U.S. ambassador to Greece, Kimberly Guilfoyle has cultivated a highly visible profile, attending late-night parties and appearing on the cover of Vogue Greece. Lately, however, she has drawn a different kind of attention from Greeks.Revelations last week that a Republican donor said Guilfoyle asked him to pay her American Express bill in exchange for access to senior Trump administration officials were the latest allegations of hardball tactics or outright misconduct to emerge against her.Greeks interviewed in Athens in recent days expressed exasperation and cynicism about the steady drip of reports about Guilfoyle’s dealings, and some...