I need a best Hairstyle for my wife?

So what you mean is you decide for her and she goes out and has it done to your liking? That's really, nice of her I guess. Since I know nothing about her looks and hair now it is safe to say if she has long hair let her keep a nice natural looking mane of hair down her back that will make her feel beautiful and feminine. If you think blonde is attractive on her have her get it all bleached a nice platinum blonde and request her to keep this way.