Is a woman in puerperium's Hajj valid if she becomes pure before forty days, and what should she do if she does not experience purity but intends to perform Hajj?

A woman in postnatal bleeding (nifas) should perform ghusl (ritual bath), pray, and do everything that ritually pure women do if she becomes pure before forty days, because there is no minimum limit for nifas. However, if she does not experience purity, her Hajj is still valid, but she should not circumambulate the Kaaba until she becomes pure, because nifas is like menstruation in preventing circumambulation.