Wholeheart Mom

My 10 year-old daughter is making this "Chop and Sew" quilt for the county fair, using Mary Engelbreit fabric. I still consider myself a novice quilter, and I am having difficulty helping her decide what to do from here.

Should she just sew all twelve blocks together, crazy quilt style, with no sashing, and then add a border or two? (see photo one of all 12 blocks together)

Should she add sashing? Red, blue, black or yellow? (see photos).

Part of me is feeling like the yellow is popping out too much.... I don't want to add a sashing that would make it pop even more. We will be adding a border, but I just don't know if we should sash it or not.

Any and all opinions are greatly appreciated!

p.s. sorry for the wrinkly background fabric and messy sewing room in the photos :0)