I can't be of much help, Bob, but I admire your interest in finding out Marilyn's bio parents. My mother was adopted in Montreal and never found out who her bio parents were. She died fairly young and I used DNA to figure out who her bio family was. At the time of my early investigation the Quebec government limited access to info to birth children. Since I was a 'grandchild' of the bio parents I didn't qualify. I have to admit that I didn't contact them and pursue it. I relied on the information that was posted on their website at the time. Access to info might have loosened in the meantime. I wish you luck.
I presume that your wife didn't do her DNA. Is that correct?
All the best in your efforts.