Good advice here already. As a lesson for you next time, you need to help her chunk up the work EARLY. So if there's x weeks until the due date then the first week is research, the second week is the initial draft, the third week... etc.
You can't enable the frenzy early on and then try to pull back. After all, she feels like all that knowledge has to go somewhere (and can you blame her when she worked so hard to collect all of it?). Better to read and research LESS and have a more constrained problem space for doing the actual work of creating and practicing the presentation.
Once she does however well she actually does on this (and really, how much can the actual grade matter at this point?) then follow up with a 'lessons learned' discussion where you both discuss better ways to approach this sort of thing in the future.
