The Ducati MTS620 seat sits high. The MTS1000 is another half inch to inch higher. It can be difficult to swing your leg over especially if the bike is parked on a slope.
You wife might want to take a look at the BMW F650CS (GS is more enduro). The ergonomics (upright riding position, lower seat, wider handlebars) will probably be better for her although I'm not that thrilled about the performance of the single cylinder engine.
http://www.bmwmotorcycles.com/bikes/bike.jsp?b=f650cs
I love the Monster, too, but unless you enjoy being hunched over for few hours on long ride... I prefer my MTS620...