A Belgian Wit beer brewed with a neutral American Ale yeast strain always goes over well. (A Blue Moon clone, essentially.) -Load up the fresh orange peel.
The Green US Homebrewers forum has a Strong Belgian Golden ale recipe called "Liquid Stoopid" that I think was their most popular beer recipe among women; it's in the general vein of a Belgian tripel.
Having said that, my wife is a hophead and doesn't like most wheat beers, nor most sweeter beers.
Adam