I agree with asking her why she thinks they are too busy. My daughters like bedspreads that coordinate with the rest of the room. But they love having themed throws. They like having a Christmas quilt, a Halloween quilt and my oldest daughter has a baseball quilt with all the MLB teams and another one with the NFL quilt fabrics.
Or just figure out what her favorite colors are, make one and put it away. My guess when she sees you making one in colors she likes, she is going to want it.