You need to register for the ballot in each state and some are already cut off. The bigger ones are cutting off about now, based on something I read a few weeks ago.
If she is going to run, maybe she can still get the nomination without collection of delegate votes in those smaller states and it is her so maybe an easy rigging is still possible.
I dont think they would be able to hide a rigging as well a second time although the super delegate thing is obviously riggable and they can probably choose her even if she wasn't on original ballot.