Juhani would force push General Grievous, allowing her and Secura to concentrate on Darth Maul. Maul kills Secura, but Juhani uses the force to slow Maul and defeats him in a lightsaber duel, or just putting a short stasis on him and throwing her lightsaber into Maul before he can respond defensively.
Juhani then force camouflages and sneak attacks Grievous, and in a lightsaber duel, kills him by stabbing him in the organ sac.