Although I think there is some truth to her being desperate for the presidency, not for one second do I believe she has even remotely considered running again in 2020 and I honestly can't believe some people think she will. She may be power-hungry, but she isn't completely delusional. She wouldn't win the primary if any remotely top-tier candidate was competing against her - and this is from someone who liked her most than most last year.
She'll flirt in 2019 like Romney did, then get immediately shut down.
Not only is she desperate, but apparently she still has a lot of influence? WTF? The loss to Trump should have thrown her in the wilderness forever? But it won't be enough influence to get even 2 Superdelegates in 2020.
So my bet is she flirts with it, announces she's "considering it," Democrats will panic and the media will go crazy, then in early 2019 drops out like Romney. It'll be the prelude to the (crazy) 2020 primaries.