I Love the yellow! I have been told that yellow can be a color that is very intimidating for quilters. Don't let it be. It is a complimentary color and I feel it goes well with what you have. Do you have a Quilt viewer (like the glass door viewers) you can buy one at Home Depot cheep.
Look at your quilt through it, so you can see the whole quilt from afar, you can get a better idea of how it will look when sewn up. I use my all the time to just check things out. If one thing pops out to much you will see it also. Then think about changing to maybe a lighter yellow. But as I see it here, I love it! Good luck with this charming quilt you are making, she will surely love it. :thumbup: