Surname is quite common in Slovenia (60th most common) and appears in every region. So she doesn't necessarily have Venetian ancestry.
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I don't think she looks German at all and I've lived in Austria and been in Germany.
She looks Western Slavic to me, especially Slovene. I know many girls that look like her and most of my classmates did as well, regardless if they were blonde or brunette.
Slovenes look majority central European, but there are Balkan types as well, nothing surprising.
Ula's surname is just a regional one, it doesn't denote ethnicity. Many Slavs in the region, especially Catholic have Italian influenced names, since Italy was the regional power here for centuries.
Indeed, many Poles could easily pass for Slovenes as well.
I personally believe that despite sharing borders with the Balkans, Slovenia in general is much more Western than South Slavic. Anyone being familiar with Slovene mentality, language and traditions can confirm this.
Polish girls
https://fbcdn-photos-b-a.akamaihd.ne...294c6253811d3c
https://fbcdn-sphotos-d-a.akamaihd.n...56086460_o.jpg
https://fbcdn-photos-d-a.akamaihd.ne...7f7facfea46c12
https://fbcdn-photos-g-a.akamaihd.ne...69accc9b830b28
https://fbcdn-photos-a-a.akamaihd.ne...8af8a5e6b74952
https://fbcdn-sphotos-c-a.akamaihd.n...82432757_o.jpg
https://fbcdn-photos-a-a.akamaihd.ne...7139b7f5e7919a
hnnnnnggg
Tina Maze, Slovenian skier
http://i2.cdn.turner.com/cnn/dam/ass...al-gallery.jpg
Nice Polish police women!
https://c2.staticflickr.com/4/3535/3...bfd66f441a.jpg
Slovenian model Patricia Peklar
http://www.missearth.tv/delegates2014/slovenia1.jpg