Definitely have her look at photos and try to get an idea of what "her" idea of busy is. Many times, it's a matter of fabric choice or block size that changes a quilt from serene to chaotic. Check these out:
http://www.pinterest.com/pin/93942342199083546/
http://traceyjayquilts.blogspot.dk/2...ce-facets.html
Traditional blocks, in solids in updated setting. Not busy at all:
http://www.flickr.com/photos/jessica...ol-668862@N23/
3 versions of this:
http://www.pinterest.com/pin/280982464220947511/
http://www.pinterest.com/pin/118923246380635330/
http://www.pinterest.com/pin/123356477263086363/
And 10-Minute Blocks:
http://www.pinterest.com/pin/190769734191023574/
I'm currently planning a quilt for my brother and am leaning towards Urban Lattice.