After growing tired of watching humans and robots take her tests, GLaDOS decided to try them herself. She constructed a mobile body for herself and uploaded her consciousness into it. Then she designed another AI to create tests for her, with almost complete access to the Aperture facility. (She also designed a fail-safe in case the new AI tried to take over. She was still paranoid over the Wheatley incident).
I know I'm not the first person to make a humanoid form for GLaDOS, but I thought it was a really cool idea.
About this creation
Side shot. You can see she has a lot of wires and cords.
Back detail. You can see more cords.
Side view of the head. You can also see wires and cords that are loose. These represent the fact that her original body was held up by wires attached to the ceiling. Those black wires coming out of her head also represent hair.
Close up of her face.
Her own personal Aperture Science Quantum Tunneling Device.