It doesn’t matter where your cousin went to high school. I don’t know of any yeshiva high school that teaches intensive Gemara to girls at the same level it does to boys. Anyway, boys also typically learn intensively with their fathers, and most frum fathers do not learn this way with their daughters.
Women can’t learn Gemara the way men can because they aren’t brought up to do so. They don’t have the skills or the resources, even if some (the type who become lawyers) do have the natural aptitude.
If you’re going to say that women can’t spend all day on a Maharsha because they need to “beautify themselves and talk about social relationships”, then you should also say that men can’t spend all day on a Maharsha either because they need to research the stock market and talk about last night’s Knicks game. It cuts both ways. There are always going to be distractions. A serious learner will buckle down and dissect a Maharsha regardless of what those distractions are.
The daily schedule of a lawyer is typically very different than the daily schedule of a full-time learner. But the intellectual challenges are very similar.