I can't begin to count the number of posts here recently about recipients not appreciating their quilts. That being said: if the quilt is for your sister and she chose the pattern and the fabrics - make her the quilt she chose! It may not be your favorite thing to work on if these are not your colors - but apparently they are HERS. Finish it as she wants it - she will love it and be very appreciative of her quilt! OK - down off my soapbox.
Oh and btw - not that it matters - I love the fabrics and think your quilt will be beautiful!!