I think this is a little excessive. She didn't run a very good campaign, and she made one huge strategic error in devoting resources to Arizona, Georgia and other longshot states instead of devoting those resources to the "firewall" states. But she did some good things too: she dominated the debates, she drew out Trump's worst instincts well on several occasions, etc.
There's a tendency to Monday morning quarterback too much after upset losses. Sure, she made a lot of mistakes, most notably falling victim to overconfidence. So did the 73-9 Golden State Warriors when they were up 3-1 in the Finals. But just like those Warriors blowing that 3-1 lead, it still took a crazy confluence of events for her to lose the election- efforts from Putin and Wikileaks, the Comey stuff, state legislature and election board efforts to limit turnout (esp in WI and NC), and Trump winning incredibly close races across the map while she comfortably won the popular vote.
And now people are retroactively changing the narrative of the campaign to make it fit the result. See eg
@Grace Under Pressure saying she ignored Western PA when she was in Pittsburgh at least twice in the final week of the campaign, or all the people who say she didn't try to reach out to angry white rust belt voters- she did, it was a huge part of her policy proposals, they just didn't feel like listening to her and/or Trump drowned her out.