the only thing about the back the judges are going to (judge) is whether or not it is square, with filled binding ect. the backing does not have to 'match' the front...lots of people make what they consider reversable quilts with one side being 'wintery' and the other 'summer-y' or pieced with what ever scraps they have, or just muslin...it is all ok...the workmanship is what matters not the subject. so, get it quilted for her, she is running out of time. as a long arm quilter i have seen lots of different backings come through the door...it is the choice of the quilter to use what ever she/he likes.