I'm 63 and I love it! Bright, funky, fun!
However, if you're looking to tone it down some, I think I would separate the larger blocks with sashing. Probably white, and then do something fun in the border and binding. Maybe a white border, wide. And then make your own binding out of strips of all the fabrics, then cut it on the diagonal. A diagonal binding could continue the 'fun' aspect of the quilt.
Have fun! I'm sure she'll love it!