It sounds like you and your dh are on the same page; that is a very good thing.
I'll add one more thing, do not think you are going to somehow sway someone who is so vehemently opposed to homeschooling with logic, good curriculum, excellent test scores or wonderful well adjust, bright children.
Now, maybe if you are lucky, a few years down the road she will see what amazing people you're raised and educated and begrudgingly accept that you are the exception to her rule. Many of us here have learned this the hard way that there is no reasoning with unreasonable people.