Aren’t both her maternal grandparents Italian. That makes her half. But she only mentions them when she wants to seem exotic or an expert in heritage tailoring.
Shes an expert bull shitter I'll give her that, if part of my ancestry is Scottish (from both grandmothers on both sides of my family were scottish, not sure if on my mums side which side my Nan's was, but was my Gran on my Dads side, her father was Andrew Bruce.
Does that mean I'm Scottish?
I'd genuinely love to have a look at her brain, see how its wired as thats not what anyone with any brain power would say (heck even when people claim to be related to King Robert I its super cringy, it's like yeah right, even if they had it'd be very, very, very slight and that's putting it lightly, just reality lol).
Though probably Charles Bruce can lol, aka Lord Bruce, Earl of Elgin and Kincardine's eldest son.
Or heck even Norman French
lol since that's where the Clan originated from, until after the Norman Conquest lol.