She's going to try and bring peace. Disbanding militaries doesn't take away a soldier's training. Disabling high-level tech only makes people resort to more primitive weapons. There will always be some kind of conflict as long as two people live. The only way to maintain a peace is to micromanage every aspect of someone's life, essentially robbing them of free will.
Really, it's only a matter of time before she decides it's best to just kill everyone to get peace.