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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:

MP1:phazon suit

MP2:Light suit

MP3: see above answer

Fusion: "omega suit"

zero mission: Gravity suit

super metroid: Gravity w/ hyperbeam

Other m: Who knows? :)

Phazon lord