Good Deeds

In Luke's gospel, early on, Mary goes to visit her old cousin, Elizabeth, who is pregnant, like Mary.  Why did Mary travel that arduous road to her cousin?  If Mary did it so that people would praise her, shower her with esteem, focus attention on Mary, then she would be like me at times, who does a good deed so that you will like me or praise me, or tell me how important I am.  It is a good deed, but I don't grow from it.  My ego does, but not my spirit.  Now, if Mary did it so that she could be helpful, not focusing on herself or caring that anyone else does, then it would be a good deed that fills her soul.  So, why are you helpful?