Lazy and shallow. Clinton made a number of critical mistakes, any one of which could have been the key. The popular vote win doesn't matter. She needed the three key states that she lost by a total of less than 80K votes, but she failed to campaign there, just assuming they were going to vote for her. She declined to engage the public in rallies as tRump did, preferring instead to hold tiny fundraisers. And her "deplorables" comment probably did more to animate tRump's supporters to come out and vote than tRump himself.
Clinton started out with all the advantages. She was a woman when Democrats were aching for a woman president. She had better name recognition than Jesus. She had better qualifications and experience and all the connections and years of campaign workers experience as well. She had almost twice as much money. If you think that starting where she was and ending up where she did is a perfect campaign, you should stay out of politics.