If you have a stretch of slow enough water,before setting out for the trip, play with the canoe, dump it, do all the routine safety stuff, climb in and out of it, but have fun, don't make it too serious. Then put the gear in and go for your trip. If it truly is flat water, get her a low beach chair or canoe seat designed for putting on the floor of the canoe, with the back facing forward. Best for ponds or lakes, but slow rivers also, but only if you are experienced and she is confident. If you use a beach chair, ( the legs are only about 4-6 inches high. ) put some foam pipe covers over them for gription and silence. Her sitting this way not only lowers the center of gravity, but it is romantic as well.