Brogan, her father is of Romanian extraction and the mother Chinese, she was born in Canada, by the norm, she would take nationality from her parents but a citizen of her birth country, convention would seem that if her parents are married she would take nationality from her father, however from the Afghan evacuation there seemed to be a large number of people described of being British nationals evacuated but not of British indigenous appearance.
Taking the above into account the question is are the parents now British citizens and one assumes she is as apparently she has a British passport.Being British is a registration, being English, Welsh, Scottish or Irish is not the same, technically being Irish can be described as British as they are born in the British Isles but their nationality is Irish, but not a British citizen, the correct description for her is UK citizen with dual nationality, for the media purposes is that she is British which is the convention today.