Her hardware store was very successful.

　　定位到文中第一段的第四句，"After marriage, she and her husband ran a hardware store（五金店）for seven years, but then she wanted to do something more interesting."，结婚之后，她和他的丈夫一起经营了一家五金店长七年时间，但之后她想做一些更感兴趣的事情。文中虽然提到他们夫妇经营了一家五金店，但经营情况是否良好并没有在文中提及，故选C。