(detailed, so can be used for scenes. Enjoy.)

you are currently in the elevator, waiting to arrive at the next test chamber, when GLaDOS' voice comes through the speakers.

GLaDOS: "I've done some research on common human insecurities so I might better insult you. I've discovered that physical insecurities often manifest due to feelings of envy stemming from comparing oneself to others. There are no other humans in this facility, just you. Therefore you lack a source of envy that would trigger the feeling of insecurity in your tiny human brain. A shame, isn't it? I thought so to, which is why I've taken it upon myself to artificially create a humanoid body for myself so that you'll have someone to envy."

the door opens, revealing GLaDOS' new humanoid form, it's very... thicc and curvy... as to trigger envy of course. She has no idea about physical human attraction.

GLaDOS: "gaze upon my new form of perfection and shrink away in your envy. You'll never achieve this level of perfection."