Happy for some people is an unattainable state because nothing makes them happy. However, if she is not just some person then she needs to know this. A wife wants to be loved, feel useful or needed, and know that her spouse is honest, faithful, and reliable. Be considerate, kind, and try putting her needs before your own. Let her know how much you love her. Be verbal with your affection and commit to small acts of kindness towards her. If you could do all of these things and be all of these things most of the time I believe your wife would be happy.