are you sure of her date of birth? I ask because there is a birth for a Phyllis Genevieve Pierzinksi Jan. 3, 1935 - name seems so close Phyllis is right Genevieve could be shortened to Jean and Pierzinski is awfully close to Prizinski
It could be that for some reason her birth date was changed on records after adoption? OR it could be this is not her. I just wanted to give it to you because of the close similarity in names.
Do you know when she was adopted as she would likely have been using her birth name until that time. I looked in the Minnesota birth index to see if I could find any girls born on the date you haveand did not find any in Winona and none with a name close to hers. I wonder, though, if the children born in orphanages were not included in the index ??