Since this is your first quilt, I don't think I would get too hung up on the colors. What you have so far is lovely and the fabric choices coordinate well. It might not be something that you would pick for a toddler, but toddlers do grow! I would finish the quilt just as you have it and count it as learning the quilting experience. When it is done, you can give it to someone as a gift, keep it until your little one is a bit older or just give it to her now. A darker quilt for a toddler won't show as much dirt after it's been dragged around!