Girl uncovering her hair when a boy comes to propose

We follow a practice in the case of a marriage proposal that first the boys mother comes to see the girl, then both parties make itikhara, if positive, then we go for investigation, meet the boy personally and thereafter when everything appears to be positive, the girl and the boy are shown to each other face to face. My question is that when the girl is shown to the boy after all other steps are done, can she show her hair or uncover her head in front of the boy only with whom she is being proposed to marry?