I think Wikipedia succinctly provides a factual assessment in this case: "The United States Electoral College is the mechanism established by the United States Constitution for the indirect election of the President of the United States and Vice President of the United States. Citizens of the United States vote in each state and the District of Columbia at a general election to choose a slate of "electors" pledged to vote for a particular party's candidate."
One can argue about the merits of the popular vote, but as per the Constitution, elections are won according to Electoral College vote.
That's the rules. That's how it works. Since the 18th century, with little change.
Mrs. Clinton also had a chance to win a round of Yahtzee, if Rock-Scissors-Paper were used to determine the winner.