I was surprised she didn't make her move this time. She was born in 1949, so she would be 71 while running, turning 72 in her first year of office. I think that in 2020 the Dems will want a newer face rather than being the party of the geriatric revolutionary.
We will see who they start building up over the next year or so.
The thing is, they are a mostly geriatric party. This is the fruit of the republicans having so many red states and the Congress.
I think she was intimidated by Hillary's supposed inevitability. After the election, she has supposedly been running to every camera she can find.