Let's play armchair quarterback

[Small Business Owner of Any Repute]

She needed to work harder in all those caucus states.

Exactly.  She punted WAY too many small caucus states because she figured they wouldn't matter.

Had she cared more about the bare-knuckle delegate fight, and less about "momentum," she might have enough extra delegates to have a legit shot at a convention win.  (Unlike now, where she could still win, but it'd be a dirty win that would fracture the Democratic Party for years along racial lines.)