Some people just didn’t hear what they wanted to hear, even when Hillary said exactly what they wanted to hear.
And it’s not like she’s been exactly silent since the election. But then, again, some people don’t want to be bothered since she’s not doing rallies and pointless townhalls to bash the Democratic Party.
Sometimes actions are much louder than words to the people (read: children, among others) who need her activism the most, especially now.