Does Hillary Clinton have the 2020 nomination "locked in" if she wants it?

Did you notice all the talk about "new faces" in Congress and "the most diverse incoming class ever" …?

Have you noticed that many of these "new faces" defeated the Democrats in long-standing establishments …?

Have you noticed that many of them, like Alex Ocasio-Cortez, achieved victory in the primary by competing against everything Hillary represents in the game?