I think typical milestone charts are designed to give a baseline so parents know when to worry. That doesn't have much relevance for parents of advanced children trying to figure out what is "normal" or average. I like the pbs.com child development tracker because it says both what most kids can do at any given age and what some/a few kids can do at a given age. I am confident that DD is gifted (and probably highly gifted) because, at 3, she is doing things that only a few 5 year olds can do (according to PBS). Well, and I've got the gut feeling, and the family history, and then there's the fact that she reads first, second, and sometimes even third grade readers independently.
Since we are leaning towards homeschooling, testing just doesn't make sense for us right now. We will likely test when she is 5 or 6. I think if she tests HG+ it will help DH be more comfortable with homeschooling. And, of course, if she has high enough scores for DYS, we would want to have access to that resource.
You may want to check with your district to see if they offer testing for free. It might be a good place to start. Your daughter certainly has some advanced skills.
