i don't think it will be to bad cause she sleeps through the night and it seems like it would be easier not to mess with her sleeping schedule

actually that is a good age for travelling! Driving at night is the best idea! I would stop at rest stops for a break to change and just stretch your legs. Bring a few favorite toys but for the most part at that age they are really easy to travel with! I flew to Oregon by myself with my son to visit my parents when my son was 5 months old and it was easier then when he was 18 months lol