If she does not want a full on road bike, any of the flat bar road bike options should work well and they usually will fit wider tires making for a more comfortable ride.
I would just take her to your favorite local shop and have her test ride a couple bikes and go with what feels the most comfortable. She could even buy a 29" wheeled mountain bike and put road tires on it for a more comfortable ride and the option to ride off road in the future with just a tire swap.
For saddles, that is a tough one to make suggestions for but a lot of shops have a selection of demo saddles so she can try a few and go with what feels best.