Nobody can say as there have been numerous changes in the last hundred years or so. It would be impossible to isolate the effects of feminism from all the others. Not that people need any evidence to believe what they want to believe
Women have far more choices now and are less dependent on men, so I doubt whether feminism itself has made women unhappy,
Those who seem most desperate to believe this claim about the effect of feminism, and most keen to tell women how unhappy they are, as the answers here show, are generally men. In any event, the question is rather academic since feminism was always going to happen.