You make a variety of good points (and convey telling anecdotes) about how Sharia Law is regressive when it comes to women.

However, the above observation has nothing to do with it. That maternally imprinted genes may matter more for cognitive development of offspring (honestly, the data is more suggestive than conclusive, given how incomplete our knowledge is) doesn't say anything about how you should view the mothers except possibly "keep daughters of smart people alive to bear children rather than sons, or you'll have to wait a generation between seeing the smarts". (Again, I don't think the data is strong enough to support that, but if it could, that would be the kind of statement that it could support.)

That's not exactly ammunition against Sharia Law!

Much better ammunition is the observation that, actually, if given similar educational opportunities to boys, girls are similarly accomplished academically, not so far off that a 2-1 rule makes any kind of sense.