My preschooler has been tested/evaluated, academically, at the college level.[...] She excels academically in mathematics (calculus, periodic table etc.), as well as in history and other subjects. There has not been a challenge that she fears tackling,and, often, has not won. My preschooler is only 4-years old!
Has anyone else run into this kind of situation, or have knowledge of existing programs that can be accommodating?
For mathematics, I would recommend looking at Art of Problem Solving courses. For example, if your DD4 can do all the questions in the "Are you ready?" test for their Calculus course - here:
http://www.artofproblemsolving.com/School/courseinfo.php?course_id=calculusthere's a course starting October 1st that you could sign her up for. The great thing about AoPS courses is that they are done through in real time with teachers to answer questions etc., but via a purely textual interface, so there is no reason why anyone should know how old a student is. That's very liberating.
I'd be fascinated to hear about by what means your DD has accumulated the mathematical knowledge that doing calculus suggests. I am sorry to suggest that you may be winding us up, because if you're not, you must get that reaction a lot, but I hope you'll forgive scepticism, all the same, and indulge our curiosity...
ETA John Stuart? I can only find a Gilbert Stuart, in that connection.