How to RescueEdit
Switch to Roofus near the pot at the end of the bookcase near the TV. Go through the small gap leading to the pot from the bookcase, and dig through the hole. When you get out, switch to Tweek via the Telepoint next to the pot and glide to the TV remote, pushing the button.
Once the TV has switched off, glide over to the TV and switch to Bungalow. Now go around the back of the television and enter inside. Leap on the disabled platforms to reach Kelly.