Her Butt

The AI decided to inject the Nanites into Samus's butt to start it's experiments. These Nanites are purposefully built to be unstable, so there's o telling what would happen.

Ideas:

Inflation: her ass becomes bigger

Inflation (Alt): her ass becomes bigger, but it looks to perky to be natural

Donut-hole: her asshole becomes engorged and resemble a donut, which also increases it's sensitivity

Jiggle factor: her butt will seemingly jiggle like jelly