Gretchen has a lot in common with Mama Corleone. She is elderly now, but still sharp. She expresses herself in a quiet, almost submissive way. but she is strong willed and very wise. She lives above the shop.
Gretchen knows very little of her husbands powers, she did not ask, but she does know one contact from that part of his life. A man named Faust who had spent a short time living in the shop with them.