Why would it be shoved under the seat? When you get in your car with things like that your natural movement is seat next to you or backseat right behind you....
If I'm running in somewhere, I can cram lots enough under seat in a newer model car so one can't see it as easy.
If I'm running in my house I would leave it on passenger seat where a good portion of women stick their purse and anything else in their hands.
She was staying overnight at friends and had to work in morning. Makes sense her computer was going with her on overnight.