Like many British actors, Daisy Edgar-Jones, twenty-two, has appeared in period pieces—“Gentleman Jack,” on the BBC, in which she plays a wide-eyed innocent in a huge bonnet, who, as Edgar-Jones put it, gets “a little bit infatuated” with the lead “and then is never seen again,” and “Pond Life,” an indie film set in the nineties, in which “one of the characters is listening to a Walkman.” But she’s best known for more Zeitgeisty material: her breakout role, this year, in the Emmy-nominated BBC and Hulu adaptation of Sally Rooney’s novel “Normal People,” set in County Sligo and Dublin, in which Edgar-Jones stars as Marianne, a prickly high-school outcast who falls in love with Connell (Paul Mescal), a kindly jock in a chain necklace so iconic that, in real life,…