From The TimeSplitters Wiki

Dr. Amy is a variation of Amy Chen in Timesplitters: Future Perfect. Amy dresses up as a doctor in the level You Genius, U-Genix in order to move through the lab without looking suspicious.

She wears the same outfit as Sister Faith. When she is picked, she will meditate and float up in the air and say "Inner harmony is achieved through application of will." She is unlocked when You Genius, U-Genix is beaten on easy or harder.

Gallery Entry

The only way you'll get Amy out of her regulation leggings is to wave a designer outfit in front of her.