Single pops don't always mean much for someone heavily mixed, they're just genetic midpoints and can be unrelated to someones real ancestry; someone whos half Swedish half Levantine would get Bosnian or Serb as their top single pop even tho they have no ancestrys from those countries because balkans is midpoint within their ancestrys. My k13 top single pop and top +2.
Using 1 population approximation:
1 Austrian @ 4.933784
Using 2 populations approximation:
1 50% Serbian +50% Southeast_English @ 1.658784
Nittoina is fully NW European afaik she just has weird gedmatch scores lol.