I must add that of course happiness for a woman is alternatively based on a sanctified life of any kind, including, pre-eminently, Religious Life, which, when lived well, imparts enormous joy and fulfillment. No one is more fulfilling than Our Lord Jesus Christ, or as fulfilling.
I also respect women who have not managed to marry, apparently through no fault of their own, but who sanctify their lay lives in other ways by embracing the Catholic understanding of womanhood and who exemplify charity and the other virtues in their lives. These women also understand that the source of ultimate happiness is not a career but a more personal fulfillment based in devotion to God through one's talents, ordered to God and not to the world.
The poster jvk mentioned how feminism tempts us. So true. I currently know a woman who is very accomplished, desires marriage and motherhood fervently, but, being so enmeshed in the world due to her various professional roles, is often subject to the world's premises. She converted, and to Tradition, several years ago, but I constantly see in her this pull of the world to accommodate to it, and thus her profession tends to be what anyone (including a man) sees about her and not her deep femininity which would appeal to any man.