most likely her PED phazon Suit in it's final form, due to its ability to have hypermode power weapons on at all times
Edit: it really does depend on the game. The answear above would be correct for MP3 because of the ability to use all hyper abiity at little or no cost to your health. the ones i know are:
MP3: see above answer
Fusion: "omega suit"
zero mission: Gravity suit
super metroid: Gravity w/ hyperbeam
Other m: Who knows? :)