How old is she?

I'm actually inclined to advise you to not try to be too ambitious with travel plans, especially if you are driving and she is quite young: there's nothing worse than being cooped up in a car for hours while Mum and Dad just ogle. Why not consider just spending one or two weeks driving around The Netherlands, going into the Ardennes, and then over into Germany and back?

This way you have a relaxed holiday and you can stretch your legs, and actually enjoy a bit of the local culture too. Don't forget, you can always visit again if you like it...