Lemire made her a Canadian student of Adam Strange with two falling in love with one another. Parker then had her being the daughter of Sardath who was studying humans but got taken back to Rann forcing him to leave his human wife and half human daughter behind. Alanna was not aware of her parentage till then.
But I agree. I think it works better that Alanna is from Rann. Something John Carter about it. Two people from different races falling in love and all. Sounds better to me. Just my opinion though.