I love the idea of red with that dress, and that's what I was going to suggest. She could also do a big bangle with it, in a bold color (teal comes to mind), and some fun earrings. That's a pretty dress.
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"Good taste shouldn't have to cost anything extra." - Mickey Drexler
I was thinking red bag too, or even red shoes and black or bone bag. If she has any beige pearls (versus pearls with a pink or green tint) that could be pretty - perhaps a pearl bracelet or short pearl necklace.