We're always child-led, except for a couple of weeks around this time of year when I check his progress on the grade-level requirements for his age. (This happened right before I gave him at-grade-level testing both years, too, BTW.)
Reviewing his grade-level material has taken no more than a couple of easy, casual weeks either year we did this. Mostly it's just a day or two of my going down my checklists and saying "Do you know this?" and "Can you do that?" In response to probably 98% of the questions I ask, he snorts at me because they're so easy. Anything he doesn't know, I try to teach right then. For those few things he doesn't know that require reading something (usually history or social studies, subjects that we just did something else for because DS7 was into something else during the year), I check out an easy, at-grade-level book or two for him and we crank it out quickly. No one said they ALWAYS have to read the hard stuff; if he were interested in the topic, we'd have already read the hard stuff! This is just about coverage. Easy is fine.
It's quick, it's painless, and I make sure my teaching him isn't allowing him to fall behind on anything.
As an aside, I'll bet the "If she's taking chem she must be missing something else" comes from people who don't get that HG+ kids don't take as long to learn. The only way most kids could take chem early is if they skipped something else important. Not necessarily so for HG+ kids. So this is really just a variation on the "Don't push her!" theme, I suspect. Don't let it worry you unnecessarily.
