Having gone through this process myself, I actually found that researching the schools, and applying to a nice group of schools based upon this research is MUCH more valuable than visiting and merely talking to a few students and seeing what the school really wants you to see.
That being said. Really scrutinize when you are researching said schools. I originally had a list of around 20, and then decided that I wanted an academically challenging environment both in the classroom and out. I then decided that it would be nice to be near a reasonablly sized city.
So in the end it was not the factors that I saw when visiting that dictated where I would apply, but moreso factors otherwise. I seem to feel that visiting is not inherently neccesary UNTIL the student gets in. Once this happens then I do not think that the typical Info session/tour is most helpful, but rather a college overnight visit, and college class session. This allows the student to see what will be impacting their college experience the most. I have even visited schools (tour/info session) coming away with almost nothing.
What intrests your daughter? What does she look for in a college? Perhaps I/others could be of service in the search for schools to apply to.