Goodbye Aperture

i have a little theory when i finished it the second time i notice that it seem strange that Glados will just let her leave with that cube, the elevator opens up to a wheat field when Aperture is a GIANT place, plus i keep thinking how it was day and it wasn't so to long that Cell passed out when she send Him to space....i keep thinking why so i came up that sees still in Aperture stuck there in a ruff puzzle and behind the shed is her portal gun ready for more test, or find rat man and both leave with the big shocker is Glados is her mother