I always think that Kristyn is a princess because she wears a crown in the last performance on stage when she is wearing a beautiful pink dress in the teaser trailer .And also there is a prince named Prince Siegfried, but sometimes I don’t think she’s a princess because in Swan Lake Odette is not a princess and there is prince named Prince Daniel. Well anything is possible!

I don't think she is a princess. She is just a regular ballerina. But if she marries Siegfried that changes things.
BTW The whole movie seems to be awesome and I'm very very optimistic about it. A lot of classic movies elements are back.
I just think Hailey will have a bigger role than other Barbie's friends did in monder movies. And also Siegfried seems to have a bigger role than Liam and Nicholas. The plot and the villain are awesome too so I can't think anything negative now for now.