GasGuage -
The Vibe (or Matrix) is my favorite. Toyota Corolla drivetrain + mini-wagon interior volume :
2003-2008 Pontiac Vibe / Toyota Matrix (35.5 MPG) | Hypermiling, Fuel Economy, and EcoModding News - EcoModder.com
If you give it a look, make sure to see if she likes the seating position. Some people have claimed that it's not comfortable.
CarloSW2