You may consider an inflatable, with an electric pump.
The user-friendlyness of an inflatable may appeal to her (no dings, fits in any car), and you can take long ones that cruise great without transport & storage constraints.
Otherwise, the new "hybrid" shapes with some convex hull in the nose for cruising but with surfable rails are a good option too... see this topic:
www.seabreeze.com.au/forums/Stand-Up-Paddle/Review/New-Board-for-Wife/Note that the new "long leaf" Tom Carroll designs may fit the bill also.