Worst case scenario is that they hide the lineage of Daisy's character and we don't find out until later in the movie or the next movie(s).
"She's playing Jane Doe, forced to make her way alone in a tough, dangerous town on Tatooine. Now at the start of the movie, she has become street smart and strong. She is able to take care of herself using humor and guts to get by. A survivor, not a victim, she remains hopeful that she can move away from this harsh existence on Tatooine to a better life. She is always thinking of what she can do to move ahead!"
"Shut up and eat your apple."
http://forums.superherohype.com/showpost.php?p=28944391&postcount=219
An extra (he/she are in the TMZ photos, this person is legitimate) in Abu Dhabi on the set said this about her there (this quote has been
slightly altered in not obvious ways to protect their identity):