There’s nothing wrong with persevering. If Hillary passionately wants to be President, she ought to try again. E.g., see Abe Lincoln’s famous list of failures before he became President http://www.abrahamlincolnonline.org/lincoln/education/failures.htm
BTW the Dems have very few plausible candidates for 2020, so she might be their best shot.
Yeah, but I bet another woman candidate on the Democrat side would beat Hillary to the nomination.